Measures Wet Bulb Globe Temperature (WBGT), Thermal Work Limit (TWL), heat index, temperature, humidity and much more. 15 measurements in all!
Waterless! Natural Wet Bulb Temperature accurately calculated from on-board digital sensors with no tedious setup or maintenance.
Large, hi-res, hi-contrast, graphic display is perfectly readable in the brightest sunlight and is backlit for use in low-light conditions.
Handheld, portable, data logger with customizable warning flag settings, graphing and measurement statistics.

Kestrel 5400 WBGT Heat Stress Tracker (HST) & Weather Meter Overview

Environmental Measures
	Altitude (Barometric)
	Barometric Pressure
	Compass Direction**
	Crosswind**
	Density Altitude
	Dew Point Temperature
	Globe Temperature
	Headwind/Tailwind**
	Heat Stress Index
	Naturally Aspirated Wet Bulb Temperature
	Relative Humidity
	Station Pressure (Absolute Pressure)
	Temperature
	Thermal Work Limit (TWL)
	Wet Bulb Globe Temperature (WBGT)
	Wet Bulb Temperature (Psychrometric)
	Wind Chill
	Wind Direction**
	Wind Speed/Air Speed
** Available with Pro version with Compass and Link + Vane Mount
Tips For Taking Accurate Measurements

The next generation of WBGT and environment monitoring is here with the Kestrel 5400 Heat Stress Tracker.

The Kestrel 5400 is a trusted and accurate handheld, portable, WBGT (Wet Bulb Globe Temperature) measurement tool and environmental data logger. No need for distilled water, bulky globes, complicated setup or expensive equipment. Getting accurate measurements couldn’t be easier: just hold the Kestrel Heat Stress Tracker in the area of interest for both instantaneous and average WBGT measurements. Set the appropriate WBGT thresholds for flag warnings and the loud buzzer, bright LED beacon and on-screen warnings provide instant notification of dangerous conditions. The Kestrel 5400 even comes preprogrammed with several athletics, industrial, and military guidelines to further ease the set-up process.

"In most situations environmental heat exposures should be assessed by the Wet Bulb Globe Thermometer (WBGT) method."
-- NIOSH Recommended Standard Publication
Occupational Exposure to Heat & Hot Environments
Department of Health & Human Services, CDC

Unlike other WBGT meters on the market, the Kestrel 5400 is a full-featured weather meter as well. Measure wind speed, maximum wind gusts, temperature, humidity, pressure, wind chill, density altitude and more. No matter what your activity, the Kestrel 5400 provides insight into the critical conditions affecting safety, performance and success. The Kestrel 5400 with LiNK wireless data communication adds a compass for tracking wind direction as well, expanding its usability to include HAZMAT response, and even measuring headwind at the running track!

The Kestrel 5 Series platform offers a large, high-resolution and contrast display with ease of font readability. It also includes a built-in dual color backlight, extra-strong polycarbonate lens, AA battery operation and optional LiNK iOS and Android wireless connectivity and app support. Like all Kestrel meters, the Kestrel 5400 is drop-proof, dust-proof, waterproof and able to withstand harsh environments without damage – so it can be used anywhere needed to keep athletes, workers, military personnel and animals safe from heat injury. A range of carry pouch options makes it even easier to take your Kestrel meter with you.

Pair the Kestrel 5400 with the optional Kestrel Vane Mount for hands-free measurements over the course of the practice, training session or workday. And for maximum functionality, choose the Kestrel 5400 with LiNK to transmit live measurements to your phone or tablet when you’re within range. Learn more about Kestrel LiNK.

In addition to measuring the current environmental conditions, the Kestrel 5400 tracks and logs over 10,000 sets of time-stamped data. Your data log can be transferred to a iOS/Android device wirelessly with the LiNK wireless communication option and Kestrel LiNK app, or to a Windows/Mac device with either the accessory Kestrel LiNK Dongle or waterproof USB Data Transfer Cable (Both sold separately).

Kestrels have been put to the test in some of the harshest conditions on the planet. U.S. Special Forces, combat weather teams, wildland firefighters, smoke jumpers, Mt. Everest expeditions and auto pit crews are just a few who rely on a Kestrel to provide them with the crucial environmental data they need. The Kestrel Heat Stress Tracker line has been used by the US Army, US Navy, athletic trainers, and even organizers at the Boston Marathon. There truly is no comparable environmental safety monitoring tool on the market. Adopt best safety practices for your team or workplace and add a Kestrel Heat Stress Tracker to your toolkit.

Engraving Note: Please make sure that everything is spelled correctly, as your engraved product cannot be returned. All sales are final on engraved products. Add 2 business days to all engraving orders.

Learn more about setting up your 5400 Heat Stress Tracker.

Which Kestrel Heat Stress Unit is right for me?

MEASUREMENTS	Kestrel DROP D2HS Heat Stress Monitor	Kestrel 3000HS Heat Stress Meter	Kestrel 5400 Heat Stress Monitor	Kestrel 5400 Heat Stress Tracker Pro with Compass and LiNK + Vane Mount
Temperature	✔	✔	✔	✔
Relative Humidity	✔	✔	✔	✔
Dew Point Temp.	✔	✔	✔	✔
Heat Index	✔	✔	✔	✔
Wind Speed		✔	✔	✔
Wind Chill		✔	✔	✔
Global Temp			✔	✔
Naturally Aspirated Wet Bulb Temp			✔	✔
Wet Bulb Globe Temp (WBGT)			✔	✔
Thermal Work Limit			✔	✔
Wet Bulb Temp (Psychrometric)			✔	✔
Station Pressure (Absolute Pressure)			✔	✔
Barometric Pressure			✔	✔
Altitude			✔	✔
Density Altitude			✔	✔
Direction				✔
Crosswind				✔
Headwind / Tailwind				✔

Features

Alarm buzzer
Alarm Light
Backlight - Switchable White/Red
Battery Life Indicator
Black Globe Temperature Sensor (1in/2.5cm)
Data Log Graph View
Data Logging - Adjustable Interval
Date & Time
Digital Compass (Pro model only)
Drop-Tested to MIL-STD-810G
FREE Kestrel LiNK Apps for Windows & Mac*
Integrated Flip Open Impeller Cover
Intuitive Tactile Up/Down/Enter Keypad
LiNK Wireless Communication - When Option Selected (Bluetooth low energy)*
Multilingual Menus (English, French, Spanish, German)
Minimum/Maximum/Average Reading
Pressure Sensor
Relative Humidity Sensor
Temperature Sensor (Patented External Isolated)
Waterproof to IP67 (3'/1M for 30 minutes)
WBGT Warning Flags - Settable

* Applies to LiNK models only

Includes

Battery - 1 x AA
Certificate Of Conformity (Spec Sheet)
Heat Stress Reference Card (Waterproof)
Instructions
Lanyard
Protective Drawstring Pouch

Connectivity

Kestrel LiNK for iOS & Android

The Kestrel LiNK® App for iOS/Android allows you to Wirelessly connect with iOS and Android devices and remotely view real-time environmental data and receive alerts for changing conditions. Available for your Kestrel 5 Series Meter or DROP Logger, Kestrel LiNK also provides easy transfer of the Kestrel's stored data log, a clear graph of all historical data. Alerts can be customized based on temperature, heat index, wind, or other measurements. LiNK enables easy firmware updates of Kestrel 5 series meters.

Data is transmitted wirelessly via Bluetooth® Low Energy within wireless range (100' line of sight- reduced by walls and obstructions). Mobile device and Kestrel must remain within range to trigger alerts.

Learn more about what the Kestrel LiNK app can do for you.

Download from your App Store

An application that can be used to view and analyze your Kestrel data on an iOS or Android device.

Kestrel LiNK for Windows and MAC

Kestrel LiNK for Windows and MAC provides a desktop solution for data retrieval and export as well as firmware updates. Expanded connectivity options allow you to wirelessly connect LiNK enabled Kestrel 5 Series Meters, using the optional LiNK USB Dongle, or make a wired USB connection with non-LiNK Kestrel 5 Meters using the USB Data Transfer Cable.

Kestrel LiNK for Windows (Size: 10.7 MB)
Kestrel LiNK Version 1.04.04 for Windows

Kestrel LiNK for OSX (Size: 10 MB)
Kestrel LiNK Version 1.04.04 for OSX

Kestrel LiNK Devices on Ambient Weather Network

Kestrel LiNK devices, including the Kestrel 5000 series meters and Kestrel DROP data loggers, can now connect to the cloud-based Ambient Weather Network (AWN) platform for extended remote monitoring capabilities.*

You can set up your Kestrel device at any desired location that has an internet connection and then view the onsite conditions from wherever you are -- on the AWN app or AmbientWeather.net. You do not have to be onsite to remain in the know about your weather conditions.

Create a free account at AmbientWeather.net

Download the AWN app

*The Kestrel LiNK device data transfer to the AWN cloud platform functionality is specific to Android devices, as the integration with AWN and the transmission of data via the LiNK app relies on the Android platform's capabilities. The Android device must be within Bluetooth range and connected to the internet in order to transmit data from the Kestrel device to the AWN cloud platform. This allows for real-time monitoring and data analysis from virtually anywhere.

Specs

SENSORS
SENSORS	ACCURACY	RESOLUTION	SPECIFICATION RANGE	NOTES
Wind Speed \|Air	Larger of 3% of reading, least significant digit or 20 ft/min Speed	0.1 m/s 1 ft/min 0.1 km/h 0.1 mph 0.1 knots 1 B* 0.1 F/S*	0.6 to 40.0 m/s 118 to 7,874 ft/min 2.2 to 144.0 km/h 1.3 to 89.5 mph 1.2 to 77.8 knots 0 to 12 B* 2-131.2*	1 inch\|25 mm diameter impeller with precision axle and low-friction Zytel® bearings. Startup speed stated as lower limit, readings may be taken down to 0.4 m/s \|79 ft min\|1.5 km/h \|.9 mph \|.8 kt after impeller startup. Off-axis accuracy -1% @ 5º off axis; -2% @ 10º; -3% @ 15º. Calibration drift < 1% after 100 hours use at 16 MPH\|7 m/s. Replacement impeller (NK PN-0801) field installs without tools (US Patent 5,783,753). Wind speed calibration and testing should be done with triangle on impeller located at the top front face of the Kestrel. Measuring wind speeds above 60 m/s / 134.2 mph can damage the impeller
Ambient Temperature	0.9 °F 0.5 °C	0.1 °F 0.1 °C	-20.0 to 158.0 °F -29.0 to 70.0 °C	Airflow of 2.2 mph\|1 m/s or greater provides fastest response and reduction of insolation effect. For greatest accuracy, avoid direct sunlight on the temperature sensor and prolonged sunlight exposure to the unit in low airflow conditions. Calibration drift is negligible for the life of the product. For further details, see Display & Battery Operational Temperature Limits.
Globe Temperature	2.5 °F 1.4 °C	0.1 °F 0.1 °C	-20.0 to 140.0 °F -29.0 to 60.0 °C	Temperature inside 1in\|25 mm black powder coated copper globe converted to Tg equivalent for standard 6 in\|150 mm globe. Closest equivalence obtained with airflow greater than 2.2 mph\|1 m/s.
Relative Humidity	2%RH	0.1 %RH	10 to 90% 25°C noncondensing	To achieve stated accuracy, unit must be permitted to equilibrate to external temperature when exposed to large, rapid temperature changes and be kept out of direct sunlight. Calibration drift is typically less than ±0.25% per year.
Pressure	1.5 hPa\|mbar 0.044 inHg 0.022 PSI	0.1 hPa\|mbar 0.01 inHg 0.01 PSI	25°C/77°F 700-1100 hPa\|mbar 20.67-32.48 inHg 10.15-15.95 PSI	Monolithic silicon piezo-resistive pressure sensor with second-order temperature correction. Between 1100–1600 mbar, unit will operate with reduced accuracy. Sensor may not operate above 1600 mbar and can be damaged above 6,000 mbar or below 10 mbar. Calibration drift is negligible for the life of the product.
Compass	5°	1° 1/16th Cardinal Scale	0 to 360°	2-axis solid-state magneto-resistive sensor mounted perpendicular to unit plane. Accuracy of sensor dependent upon unit’s vertical position. Self-calibration routine eliminates magnetic error from batteries or unit and must be run after every full power- down (battery removal or change). Readout indicates direction to which the back of the unit is pointed when held in a vertical orientation. Declination/variation adjustable for True North readout.

CALCULATED MEASUREMENTS
MEASUREMENT	ACCURACY (+/-)	RESOLUTION	SENSORS EMPLOYED
AHLU	AHLU Accuracy derived from HLI accuracy accumulated over time.	1.0	Wind Speed, Temperature Globe Temperature, Relative Humidity
Altitude	typical: 23.6 ft/7.2 m from 750 to 1100 mBar max: 48.2 ft/14.7 m from 300 to 750 mBar	1 ft 1 m	Pressure, User Input (Reference Pressure)
Barometric Pressure	0.07 inHg 2.4 hPa\|mbar 0.03 PSI	0.01 inHg 0.1 hPa\|mbar 0.01 PSI	Pressure, User Input (Reference Altitude)
Crosswind & Headwind/Tailwind	7.1%	1 mph 1 ft/min 0.1 km/h 0.1 m/s 0.1 knots	Wind Speed, Compass
Density Altitude	226 ft 69 m	1 ft 1 m	Temperature, Relative Humidity Pressure
Dew Point	3.4 °F 1.9 °C 15- 95% RH. Refer to Range for Temperature Sensor	0.1 °F 0.1 °C	Temperature, Relative Humidity
Heat Index	7.1°F 4.0°C	0.1 °F 0.1 °C	Temperature, Relative Humidity
HLI	2.7	1.0	Wind Speed, Temperature Globe Temperature, Relative Humidity
Outdoor Wet Bulb Globe Temperature (WBGT)	1.3 °F 0.7 °C	0.1 °F 0.1 °C	Wind Speed, Temperature Globe Temperature, Rative Humidity, Pressure
Probability of Ignition (PIG)	PIG Accuracy dependent on proximity of inputs to reference table steps.	10%	Temperature, Relative Humidity
THI (NRC)	1.5 °F 0.8 °C	0.1 °F 0.1 °C	Temperature, Relative Humidity
THI (Yousef)	2.3 °F 1.3 °C	0.1 °F 0.1 °C	Temperature, Relative Humidity
Thermal Work Limit (TWL)	10.9W/m2	0.1 °F 0.1 °C	TWind Speed, Temperature Globe Temperature, Relative Humidity, Pressure
Wet Bulb Temperature - Psychrometric	3.2 °F 1.8 °C	0.1 °F 0.1 °C	Temperature, Relative Humidity Pressure
Wet Bulb Temperature - Naturally Aspirated (NWB TEMP)	1.4 °F 0.8 °C	0.1 °F 0.1 °C	Wind Speed, Temperature Globe Temperature, Relative Humidity, Pressure
Wind Chill	1.6 °F 0.9 °C	0.1 °F 0.1 °C	Wind Speed, Temperature

ADDITIONAL PRODUCT INFO
Display & Backlight	Multifunction, multidigit monochrome dot-matrix display. Choice of white or red LED backlight.
Response Time & Display Update	Display updates every 1 second. After exposure to large environmental changes, all sensors require an equilibration period to reach stated accuracy. Measurements employing RH may require longer periods particularly after prolonged exposure to very high or very low humidity. WBGT requires about 8 minutes to reach 95% accuracy and about 15 minutes to reach 99% accuracy after exposure to large environmental changes.
Data Storage & Graphical display Min/Max/Avg History	Logged history stored and displayed for every measured value. Manual and auto data storage. Min/Max/Avg history may be reset independently. Auto-store interval settable from 2 seconds to 12 hours*, overwrite on or off. Logs even when display off except for 2 and 5 second intervals. Kestrel 5 series units hold over 10,000 data points.
data Upload & Bluetooth Data Connect Option	Wireless range up to 100ft. Connection requires optional USB data transfer cable or Kestrel Link Dongle or Kestrel LiNK app. Employs Kestrel Link protocol for data transmission with Link supported devices. (Kestrel LiNK for iOS/Android, Kestrel Link for PC/MAC).
Clock/Calendar	Real-time hours:minutes:seconds clock, calendar, automatic leap-year adjustment.
Auto Shutdown	User-selectable – Off, 15-60 minutes with no key presses.
Languages	English, French, German, Spanish.
Certifications	CE certified, RoHS, FCC, IC tested and WEEE compliant. Individually tested to NIST-traceable standards.
Origin	Designed and manufactured in the USA from US and imported components. Complies with Regional Value Content and Tariff Code Transformation requirements for NAFTA Preference Criterion B.
Battery Life	AA Lithium included. Up to 400 hours of use, reduced by backlight, alert light and buzzer, or Bluetooth radio transmission use.
Shock Resistance	MIL-STD-810g, Transit Shock, Method 516.6 Procedure IV; unit only; impact may damage replaceable impeller.
Sealing	Waterproof (IP67 and NEMA-6)
Display & Battery Operational Temperature Limits	14° F to 131° F \| -10 °C to 55 °C Measurements may be taken beyond the limits of the operational temperature range of the display and batteries by maintaining the unit within the operational range and then exposing it to the more extreme environment for the minimum time necessary to take reading.
Storage Temperature	-22.0 °F to 140.0 °F \| -30.0 °C to 60.0 °C.
Size & Weight	6.44 x 2.125 x 1.18 in \| 16.4 x 5.4 x 3.0 cm, 4.3 oz \| 121 g. (Lithium battery included)

Kestrel 5 Series Certificates of Comformity

Certificate of Conformity Kestrel 5400 Heat Stress Tracker (Size: 528.5 KB)

Kestrel 5400 Heat Stress Tracker specification chart

Models & SKUs:

Kestrel 5400 Heat Stress Tracker (Orange): 0854ORA
Kestrel 5400 Heat Stress Tracker (Tan): 0854TAN
Kestrel 5400 Heat Stress Tracker + Vane Mount (Orange): 0854VORA
Kestrel 5400 Heat Stress Tracker + Vane Mount (Tan): 0854VTAN
Kestrel 5400 Heat Stress Tracker Pro with Compass and LiNK + Vane Mount (Orange): 0854LVCORA
Kestrel 5400 Heat Stress Tracker Pro with Compass and LiNK + Vane Mount (TAN): 0854LVCTAN

Downloads

Support Documents for all Kestrels

319001 Replacing the Kestrel Impeller (Size: 271.9 KB)

Replacing the Kestrel Impeller

Product Safety and Warranty (Size: 762.1 KB)

Product Safety and Warranty Kestrel 5000 Series

WBGT Heat Stress Guidelines

ACGIH WBGT Guidelines (Size: 45 KB)

ACSM-Acclimatized & Nonacclimatized WBGT Guidelines (Size: 43.2 KB)

Georgia State High School WBGT Guidelines (Size: 440.1 KB)

Kentucky State High School WBGT Guidelines (Size: 41.4 KB)

NATA WBGT Guidelines (Size: 45.6 KB)

New Jersey State High School Guidelines (Size: 53.6 KB)

North Carolina State High School WBGT Guidelines (Size: 45.2 KB)

TB Med 507 WBGT Guidelines (Size: 45.5 KB)

Vermont State High School Guidelines (Size: 49.2 KB)

WBGT Reference Guidelines (Size: 85.9 KB)

Kestrel 5 Series Certificates of Comformity

Certificate of Conformity Kestrel 5400 Heat Stress Tracker (Size: 528.5 KB)

Kestrel 5400 Heat Stress Tracker specification chart

NK Kestrel 5000 Series EMC Declaration of Conformity (Size: 48.3 KB)

LiNK (Kestrel)

How to graph weather data from LiNK CSV files (Size: 667.5 KB)

This tutorial will show you how to create a graph of the data that you exported from your Kestrel 5000 series or Kestrel DROP using one of the Kestrel LiNK applications.

Kestrel LiNK for Android

An application that can be used to view and analyze your Kestrel data on an Android device.

Kestrel 5 Series Downloads

How to I determine the average wind direction? (Size: 837 KB)

The attached document in Excel will help with determining average wind direction and the use of a wind rose by using the exported CSV file. This would be pertinent to any of the 5500 models, especially important for spray drift and measurements in the protected zones.

Tips For Taking Accurate Measurements (Size: 346.9 KB)

Tips for taking accurate measurements Support tab at www.kestrelinstruments.com

Kestrel 5 Series Troubleshooting Documents

How to Update your Firmware LiNK for Android (Size: 744.3 KB)

A simple guide to help you update your Firmware on your Kestrel using LiNK for Android

How to Update your Firmware with Kestrel LiNK for Windows (Size: 627.4 KB)

A simple guide to help you update your Firmware on your Kestrel using LiNK for Windows

K5 LiNK for Windows Bluegiga Dongle Help (Size: 5 MB)

Troubleshooting Bluetooth Dongle Issues with the Kestrel 5000 Series Models and LiNK for Windows.

Where should I place multiple Kestrel 5400 Heat Stress Trackers to monitor WBGT? (Size: 193.9 KB)

Here is a graphical guide on locating various micro-climates in a given area to help with Kestrel 5400 placement for monitoring WBGT.

Heat Index Downloads

Kestrel Heat Index Reference Guideline - In Fahrenheit (Size: 82.3 KB)

Recommended Modifications to Athletic Participation Based on the Heat Index

Kestrel Heat Stress Reference Guide - In Celsius (Size: 82.3 KB)

Recommended Modifications to Athletic Participation Based on the Heat Index Celsius

Korey Stringer Small Price of Survival Article 2016-09 (Size: 3.7 MB)

Korey Stringer Small Price of Survival Article 2016-09 Regarding Heat Stress

Kestrel LiNK Manuals and Documentation

Kestrel LiNK User Manual (Size: 5.3 MB)

Kestrel 5 Series Instruction Manuals

Kestrel Vane Mount Instructions (Size: 123 KB)

Kestrel Vane Mount Instructions

User Guide Kestrel 5400 Heat Stress Tracker (Size: 1.1 MB)

Kestrel 5400 Heat Stress Tracker User Guide

FAQs

Product Questions

How do I get the most accurate measurements from my Kestrel?

"All measurements not available in all units"

Temperature Functions

For best accuracy when taking temperature measurements you must keep the air moving around the temperature sensor and keep the Kestrel out of prolonged, direct sunlight. If there is a strong breeze, just point the Kestrel into the wind. If there is no wind, swing the Kestrel around in a circle on its lanyard or rapidly wave it back and forth in hand. This ensures that the sensor measures the temperature of the air rather than the temperature of the case. Alternatively, if you have time, allow the Kestrel to rest where you want to measure the air temperature (NOT in your hand or in direct sunlight if there is no wind) until the case temperature equalizes with the air temperature. When equalized, the display will read a constant value. Be aware that this could take a few minutes, particularly if there is no wind.

Humidity Functions

One reason your Kestrel may not be reading accurate ambient humidity is because of proximity to humidity sources such as your hand, your body or the ground. Avoid covering the large humidity chamber opening on the case rear with your fingers. Keep all fingers below the finger groove and away from the chamber opening. Do not take reading that rely upon humidity with the Kestrel meter lying flat – raise it into the air vertically or stand it on its base and orient it into the wind or air flow. If a high level of accuracy is required for measurements involving humidity, do not hold the unit while taking measurements. Taking readings with the Kestrel in your hand or over your body can raise relative humidity by 5% or more. A Kestrel vane mount will isolate the Kestrel Meter from erroneous humidity influences and keep it oriented into the wind or air flow while taking measurements. Whenever you move your Kestrel Meter into a new environment wait until the primary sensor values have stabilized (Temperature, Humidity, etc.) before taking measurements that rely upon these values. After a large change in environmental condition, this may take 15 minutes or more, with humidity potentially taking the longest. If the humidity sensor housing (located above the rear label) is wet, the Kestrel cannot take an accurate humidity reading. If the sensor does become wet, shake the unit vigorously to remove the water, and then let it dry completely before use. If the sensor comes in contact with salt water, rinse it thoroughly with clean water, then shake it and allow it to dry. As is typical with humidity sensors, it is possible for the humidity sensor in the Kestrel to drift over time as described in the spec sheet. If your unit has a Humidity recalibration function, it can be returned to the factory or used with the Kestrel RH Calibration Kit to recalibrate its humidity readings.

Wind Meter Functions

Wind speed is highly dependent on surrounding obstructions such as buildings, yourself and the ground, with wind speeding up as it flows around and over obstacles and slowing down as it passes behind them. Even in an open area, Wind speed will be slower near the ground so ensure you are taking measurements at an appropriate height for your application. Hold the back of the unit directly into the wind. Holding the unit off-axis by 5° will reduce accuracy by 1%, 10° will reduce accuracy by 2% and 15° will reduce accuracy by 3%. Using a Kestrel Vane Mount will ensure the unit is correctly oriented into the wind and measuring accurate wind speeds. The Kestrel impeller housing can rotate in the unit. For best accuracy, ensure one of the three “arms” of the impeller housing is pointing straight up. The wind speed displayed by the Kestrel Meter is a 3 second rolling average. This allows the unit to provide a value that is more representative of the typical, ambient conditions but not capture peak speeds for instantaneous blasts of air.

Compass Functions

The compass in the Kestrel Meter is used for direction, crosswind, headwind/tailwind as well as for capturing various user inputs based on direction. When calibrating and when using the compass, it is important to hold the unit as vertically as possible. Any tilt in angle present when the unit is calibrated or when measurements are taken will negatively impact the accuracy of the compass reading. Many users will inadvertently tilt the Kestrel Meter away from themselves slightly when holding the unit. If a high level of accuracy is required, using a Kestrel vane mount on a leveled tripod for calibration and measurement can eliminate error.

Pressure Functions

All pressure and altitude measurements are made using the pressure sensor. Some units have a dedicated “Pressure” screen which shows Station Pressure, the raw pressure reading straight from the sensor. The Barometric Pressure measurement (Baro) displays the local Barometric Pressure using the Station Pressure measurement adjusted to the local altitude using the Reference Altitude value input by the user. The Altitude measurement displays the local altitude using the Station Pressure measurement combined with the Reference Baro value input by the user. To obtain an accurate barometric pressure or altitude readings, you must first know EITHER your location’s current barometric pressure OR your current altitude. If the Reference Altitude value is incorrect, the Barometric Pressure reading will also be incorrect. If the Reference Barometric pressure value is incorrect, the Altitude reading will also be incorrect. Because Barometric Pressure and Altitude are each dependent on the alternate reference value remaining constant, Barometric Pressure and Altitude cannot be accurately measured simultaneously. If your unit has a pressure recalibration function, a new Barometric Pressure calibration value may be input. If this value was not taken from a verified source (a local airport or weather station) with the Kestrel being calibrated at the same location as the reference device, pressure related measurements may be incorrect.

WBGT

When changing environments (such as moving form an air conditioned room to outdoors or removing the unit from your pocket) the unit requires between 8-15 minutes to equilibrate to its surroundings before taking readings. Take measurements at least 3 feet off the ground and in the same wind or air flow conditions as the people you are monitoring. Ensure the Kestrel is oriented into the wind and able to measure the full wind value. A tripod or pole mount and the Kestrel Rotating Vane Mount are ideal for ensuring accurate measurements. Differences in the reflectivity of ground surfaces such as grass or asphalt will impact measurements. Be sure to take measurements in the same solar/radiant heat environment as the people you are monitoring. Unlike best practices for other measurements, WBGT is intended to be taken in direct sunlight. As long as there is occasional wind the Kestrel has software that allows it to maintain an accurate WBGT reading despite being placed in direct sunlight.

Air Flow

Kestrel Professional Meters can calculate air flow through a duct by combining user input information about the size and shape of the duct with the measured air velocity. In addition to reading the instantaneous Air Flow off the main measurement screen, a more accurate result may be obtained by capturing an average air flow on the Min/Ave/Max screen while traversing the duct. Traversing consists of dividing the area of the duct into evenly sized sections and averaging the air flows at the center of all sections. By spending an equal amount of time at each measurement location and quickly moving between measurement locations, the average air flow measurement can provide a more accurate measure of the air flow in the duct. Capturing an average can be particularly helpful when measuring ducts with registers or dimensionally uneven air flow.

Evaporation Rate

(Kestrel 5200 Professional Environmental Meter) Kestrel Professional Meters can calculate a concrete evaporation rate (ACI 308) by combining a user input concrete temperature with measured air temperature, wind speed and relative humidity. Concrete mix temperature is generally measured with a probe or infrared thermometer and should be read at the time of making the evaporation rate measurement After inputting the mix temperature, hold the unit vertically, approximately 20 inches above the surface of the concrete while facing the rear of the unit directly into the wind. To avoid inaccurate Evaporation Rate readings due to thermal loading it is best to shade the Kestrel. (Be sure the source of shade is not obstructing the wind speed measurement.) The ACI recommends taking a 6-10 second average of the evaporation rate to account for fluctuating wind speeds. To measure an average Evaporation Rate, scroll right from the Evaporation Current Measurement Screen to the Min/Ave/Max Screen and press select to manually start and stop a capture.

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Can the Kestrel 5 series connect with mobile devices?

Yes! The Kestrel 5 Series now has both Android and iPhone integration through our Kestrel LiNK iOS and Android Apps. Kestrel LiNK iOS and Android apps allow LiNK enabled Kestrel 5 Series Meters and DROPs to connect wirelessly with mobile devices to view real-time measurements, receive on-screen alerts, download data and perform firmware updates. The Kestrel LiNK Ballistics app, designed specifically for the Kestrel 5700, Kestrel 5 series Sportsman, and Kestrel 5700 Elite meters, provides full gun management and access to the Applied Ballistics library of G1/G7 curves (5700) and custom drag models (Elite). For a quick look at all of the Kestrel LiNK Application Features - Click Here.

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How do I pair my Kestrel with a mobile device?

Make sure Bluetooth^® is turned ON on your phone. On the Kestrel, go to the Main Menu->Bluetooth and turn it ON. Press the center button while Bluetooth is highlighted and check to ensure that Conct is set to PC/Mobile and it shows Available. Next go to the application that you are connecting with on your phone and select the Kestrel as the device you would like to connect with. Please note: if you do not find the Kestrel on your phone’s “standard” Bluetooth connection screen, that does not mean that the Kestrel is not working properly. Please first go to the application and try to connect through the application. The Kestrel should connect.

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How can I transfer data to my unit if I do not have the LiNK (i.e., Bluetooth) model?

All models of the Kestrel 5000 Series have optical data ports that can be seen through the openings of the battery door. A USB Data Transfer Cable can be purchased separately, which plugs directly into the back of the Kestrel and extends to a USB port in your computer. You will NOT be able to connect a non-LiNK model unit to a mobile device (e.g., any device without a USB port).

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What can I do with LiNK for WINDOWS/iOS/OSX/ANDROID?

These programs handle uploading the weather data from the Kestrel to a specific device. This weather data can then be exported into MS Excel. You can also update your firmware any of these programs. Visit the Kestrel LiNK Software and Apps page to learn more.

LiNK Applications Features

	LiNK for Desktop		LiNK for Mobile Devices		LiNK Ballistics for Mobile Devices
	LiNK for Windows	LiNK for OSX	LiNK for iOS	LiNK for Android	LiNK Ballistics iOS	LiNK Ballistics Android

	Download stored data log for viewing and saving
Download stored data log for viewing and saving	✔	✔	✔	✔
	Export downloaded data to .csv file for sharing or further analysis
Export downloaded data to .csv file for sharing or further analysis	✔	✔	✔	✔
	View and analyze downloaded data using range Min/Max/Average statistics and clear scrolling graphs
View and analyze downloaded data using range Min/Max/Average statistics and clear scrolling graphs			✔	✔
	Set alerts for temperature, heat index, wind, etc.
Set alerts for temperature, heat index, wind, etc.			✔	✔
	Post snapshots of current conditions to social media with one click
Post snapshots of current conditions to social media with one click			✔	✔
	Get realtime readings from any Kestrel 5 meter within wireless range
Get realtime readings from any Kestrel 5 meter within wireless range			✔	✔
	Build and manage gun bullet profiles
Build and manage gun bullet profiles					✔	✔
	Wirelessly adjust the target range or direction of fire and view elevation and windage solution
Wirelessly adjust the target range or direction of fire and view elevation and windage solution					✔	✔
	Get comprehensive Applied Ballistics bullet library
Get comprehensive Applied Ballistics bullet library					✔	✔
	Build and manage gun/bullet profiles
Build and manage gun/bullet profiles					✔	✔
	Update device firmware
Update device firmware	✔	✔	✔	✔	✔	✔
	Install purchased firmware upgrades
Install purchased firmware upgrades	✔	✔

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What application do I need to update or upgrade my Kestrel firmware?

You can now upgrade your Kestrel 5700 to the Elite version using the Kestrel LiNK Ballistics application. Simply connect your Kestrel to the iOS or Android version of the Kestrel LiNK Ballistics app. Select Upgrade in the top left corner. Enter you credit card information for the purchase and the upgrade should start after payment is completed. The upgrade will look similar to a firmware update.

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How do I open the battery door on a Kestrel 5 series unit?

As can be seen in the pictures below, place your thumb on the bottom of the unit and slide the latch from the “Locked” to the “Unlocked” position. The battery door should pop up enough that you can remove it. If you have trouble opening the battery door, some slight pressure DOWN on the battery door itself with your other thumb may help release the latch.

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How do I close the battery door?

First slide in the tab at towards the top of the unit, then gently press the bottom part of the battery door down until it snaps into place. Ensure that the O-ring remains in place on the battery door when closing.

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Do I need the use a battery shim with the Kestrel 5 series unit?

No. Since the Kestrel 5 Series meters utilize only one AA battery, there is no need to use the battery shim to separate two AAA batteries as in the previous version.

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What types of batteries should I use with my Kestrel 5 series unit?

NK strongly recommends continual use of Lithium AA batteries in your Kestrel. Lithium batteries respond best in extreme temperatures and help prevent against any corrosion. Customers can also use Alkaline or Nickel Metal Hydride (NiMh) if they prefer, but we recommend turning “Auto Store” to “OFF” when placing these units in storage to minimize the drain on the battery. Also, please make sure you set the System->Battery setting to match the type of batteries that you are using.

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What are the new features and benefits of the Kestrel 5 series?

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Can I upgrade my non-Ballistics 5000 Series model to a Ballistics model?

No. Currently ONLY the Kestrel Sportsman Weather Meter with Applied Ballistics or the Kestrel 5700 Ballistics Weather Meter can be upgraded to the Kestrel 5700 Elite model.

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Why isn't there a Night Vision option for the Kestrel 5 Series?

All of the Kestrel 5000 series units have the Night Vision option in addition to the standard white backlight. There is a menu selection that allows the customer to toggle between both options.

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How often do I need to calibrate the Kestrel 5 Series?

Wind Speed – NK sells factory calibrated replacement impellers that can easily be installed by the customer. NK recommends replacing the impeller every 2-3 years depending on usage.

Humidity – The Kestrel 5 Series and DROP data loggers employ a highly accurate, calibrated, digital humidity sensor. Based on the sensor manufacturer's specifications and NK testing, drift on this sensor over time is minimal and field recalibration is likely to degrade accuracy rather than improve it. Factory calibration to validate and certify accuracy at a minimum of two RH points is available from NK. Kestrel 5000 series units can also be recalibrated in the field using our kit RH Recalibration Kit . During the five-year warranty period, NK will repair, recalibrate or replace any Kestrel 5 Series or DROP which drifts more than +/-1% RH/year since the date of manufacture.

Temperature – The thermistor in the Kestrel 5 series should not need to be recalibrated. If you think your sensor is incorrect, please contact techsupport@nkhome.com

Pressure – The pressure in the Kestrel 5 series should not need to be recalibrated. If you think your sensor is incorrect, please contact techsupport@nkhome.com

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How do I pair my Kestrel with my computer?

Kestrel 5 series units with LiNK will need to use the Kestrel LiNK Wireless Dongle to connect with a computer. The Kestrel 5 series will not work with any internal Bluetooth modules. To connect, insert the Kestrel LiNK Dongle into an open USB port. On the Kestrel, go to the Main Menu->Bluetooth and turn it ON. Set Conct to "PC / Mobile." Open the application on the computer and select the Kestrel as the device to connect to. There is no more “pairing," "COM port numbers," or "PIN Codes" to worry about for those familiar with the 4000 series.

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How do I graph the weather data using an exported CSV file?

Please see our graphing guide:

LiNK (Kestrel)

How to graph weather data from LiNK CSV files (Size: 667.5 KB)

This tutorial will show you how to create a graph of the data that you exported from your Kestrel 5000 series or Kestrel DROP using one of the Kestrel LiNK applications.

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Does the Kestrel 5 Series connect with an iPhone?

Yes! The Kestrel 5 Series now has both Android and iPhone integration through our Kestrel LiNK iOS and Android Apps. Kestrel LiNK iOS and Android apps allow LiNK enabled Kestrel 5 Series Meters and DROPs to connect wirelessly with mobile devices to view real-time measurements, receive on-screen alerts, download data and perform firmware updates. The Kestrel LiNK Ballistics app, designed specifically for the the Sportsman , the Kestrel 5700 series or meters, and the Kestrel 5700 Elite meters, provides full gun management and access to the Applied Ballistics library of G1/G7 curves (Sportsman and 5700) and custom drag models (5700 Elite).

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What are the main differences between the Kestrel 5000 Series and the Kestrel 4000 series models?

See chart below:

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What is Kestrel LiNK for OSX?

Transfer data from your Kestrel 5 Series device and archive on your Mac computer. Data logs can be exported as csv files for viewing and analysis in spreadsheets. This software also facilitates updates and upgrades to your device firmware.

Download Kestrel LiNK for MAC:

LiNK (Kestrel)

Kestrel LiNK for OSX (Size: 10 MB)

Kestrel LiNK Version 1.04.04 for OSX.

Quick Look

Manage updates and upgrades to device firmware
View device information such as device name, model number, firmware version, hardware version and serial number. Rename device.
Transfer data from your Kestrel 5 Series device wirelessly with Bluetooth dongle or with a USB cable.
Archive data logs.
Export data logs in csv format for viewing and analysis in spreadsheets.

Example Screen Shots

	Easily connect your Kestrel to the application using bluetooth.
	Manage your Kestrel: change its name, download data, and/or update your unit.
	Export and analyze your data.

Kestrel Firmware:

Kestrel 5 Series Troubleshooting Documents

How to Update Your Kestrel 5 Series Firmware with MAC/OSX (Size: 821.1 KB)

Tutorial on how to update your Kestrel 5000 series firmware using LiNK for MAC/OSX

Support Documents for all Kestrels

Kestrel 5000 Firmware Update Change Log (Size: 583 KB)

Version 1.53/2.11

Kestrel 5 Series Downloads

Kestrel Firmware Installer for Windows (Size: 16 MB)

Kestrel Firmware Version 1.49 Update Installer for Windows

Kestrel Firmware Update Files for OSX (Size: 14 MB)

Kestrel Firmware Version 1.49 Update Installer for OSX. Please see included directions as this process has changed.

Device Compatibility:

Firmware: This program is only compatible with Mac OS X 10.7 or higher.

Kestrel Compatibility:

Kestrel 5000 Environmental Meter with LiNK
Kestrel 5100 Racing Weather Meter with LiNK
Kestrel 5200 Professional Weather Meter with LiNK
Kestrel 5400 Heat Stress Tracker with LiNK
Kestrel 5500 Weather Meter with LiNK
Kestrel Sportsman Weather Meter with Applied Ballistics with LiNK
Kestrel 5700 Ballistics Weather Meter with LiNK
Kestrel 5700 Elite Weather Meter with Applied Ballistics with LiNK

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What is Kestrel LiNK for Windows?

Transfer data from your Kestrel 5 Series device and archive on your Windows computer. Data logs can be exported as csv files for viewing and analysis in spreadsheets. This software also facilitates updates and upgrades to your device firmware.

Download Kestrel LiNK for Windows:

LiNK (Kestrel)

Kestrel LiNK for Windows (Size: 10.7 MB)

Kestrel LiNK Version 1.04.07 for Windows

Quick Look

Manage updates and upgrades to device firmware
View device information such as device name, model number, firmware version, hardware version and serial number. Rename device.
Transfer data from your Kestrel 5 Series device wirelessly via the Bluetooth dongle or with a USB cable.
Archive data logs.
Export data logs in csv format for viewing and analysis in spreadsheets.

Example Screen Shots

	Easily connect your Kestrel to the application using bluetooth.
	Manage your Kestrel: change its name, download data, and/or update your unit.
	Export and analyze your data.