Measures moisture content (grains), air density, relative air density (RAD), relative humidity, temperature, barometric pressure, wind speed and much more. 14 measurements in all!
Large, hi-res, hi-contrast, graphic display is perfectly readable in the brightest sunlight and is backlit for nighttime use.
Handheld, portable weather station with onboard data logging and graphing.
Optional LiNK connectivity powered by Bluetooth® low energy provides wireless communication to mobile devices and computers.

Kestrel 5100 Racing Weather Meter Overview

Environmental Measures
	Air Density
	Altitude (Barometric)
	Barometric Pressure
	Density Altitude
	Dew Point Temperature
	Heat Stress Index
	Moisture Content (Grains)
	Relative Air Density
	Relative Humidity
	Station Pressure (Absolute Pressure)
	Temperature
	Wet Bulb Temperature (Psychrometric)
	Wind Chill
	Wind Speed/Air Speed
Tips For Taking Accurate Measurements

The next generation of track weather monitoring is here with the Kestrel 5100 Weather Meter.

When winning matters, take the Kestrel 5100 for a ride. It measures moisture content in grains, air density, relative air density, humidity and other critical factors. Count on it for the information you need to make perfect ET predictions and performance-maximizing tuning and jetting decisions.

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 5100 is drop-proof, dust-proof, waterproof and able to withstand harsh environments without damage – so it can race as hard as you do, wherever you go. A range of carry pouch options makes it even easier to take your Kestrel meter with you.

The compact, portable design makes this unit easy to take right to the track – exactly where you need to get the most accurate and race-relevant measurements. Pair it with the optional Kestrel Vane Mount for hands-free measurements logged over the course of the day. For maximum functionality, choose a Kestrel 5100 with LiNK to transmit live measurements to the Kestrel LiNK app on your iOS or Android(Coming Soon) device up to 100’ away (line of sight).

Your data log can be transferred to an 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. Watch the Weather Channel during a hurricane, and you’re sure to spot a Kestrel in action.

Affordable, accurate, portable and reliable, Kestrel meters have been proven at race tracks everywhere. Put the weather on your side – put a Kestrel in your toolbox.

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.

Features

Backlight - Switchable White/Red
Battery Life Indicator
Data Log Graph View
Data Logging - Adjustable Interval
Date & Time
Drop-Tested to MIL-STD-810G
FREE Kestrel LiNK Apps for Windows & Mac*
High Contrast, Sunlight Readable Monochrome LCD Display
Integrated Flip Open Impeller Cover
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)

* Applies to LiNK models only

Includes

Battery - 1 x AA
Certificate Of Conformity (Spec Sheet)
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 the App Store

KESTREL LiNK FOR IOS
An application that can be used to view and analyze your Kestrel data on an iOS device.

KESTREL LiNK FOR ANDROID
An application that can be used to view and analyze your Kestrel data on an 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.

Specs

The specs on this page relate to all Kestrel 5 series meters. Just because a measurement is listed in this chart does not necessarily mean that it is included with all meters. To see a listing of all measurements and features for this meter, please click on the In-Depth tab above.

SENSORS
SENSORS	ACCURACY	RESOLUTION	SPECIFICATION RANGE	NOTES
Wind Speed \| Air Speed	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.
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
Air Density	0.0002 lb/ft3 0.0033 kg/m	0.001 lbs/ft3 0.001 kg/m3	Temperature, Relative Humidity Pressure
Air Flow	6.71%	1 cfm 1 m3/hr 1 m3/m 0.1m3/s 1 L/s	Air Speed, User Input (Duct Shape & Size)
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
Delta T	3.2 °F 1.8 °C	0.1 °F 0.1 °C	Temperature, Relative Humidity Pressure
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
Evaporation Rate	0.01 lb/ft2/hr 0.06 kg/m2/hr	0.01 b/ft2/hr 0.01 kg/m2/hr	Wind Speed, Temperature Relative Humidity Pressure, User Input (Concrete Temperature)
Heat Index	7.1°F 4.0°C	0.1 °F 0.1 °C	Temperature, Relative Humidity
Moisture Content \| Humidity Ratio (“Grains”)	4.9gpp .7g/kg	0.1 gpp 0.01 g/kg	Temperature, Relative 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
Relative Air Density	.0.3%	0.1%	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	5.0 x 1.9 x 1.1 in \| 12.7 x 4.5 x 2.8 cm, 4.3 oz \| 121 g. (Lithium battery included)

Kestrel 5 Series Certificates of Comformity

Certificate of Conformity Kestrel 5 Series Weather / Environmental Meters (Size: 528.9 KB)

Kestrel 5 Series specification chart

Models & SKUs:

Kestrel 5100 Racing Weather Meter: 0851RED
Kestrel 5100 Racing Weather Meter with LiNK: 0851LRED

Downloads

Support Documents for all Kestrels

319001 Replacing the Kestrel Impeller (Size: 271.9 KB)

Replacing the Kestrel Impeller

Product Safety and Warranty (Size: 702.4 KB)

Product Safety and Warranty Kestrel 5000 Series

Kestrel 5 Series Certificates of Comformity

Certificate of Conformity Kestrel 5 Series Weather / Environmental Meters (Size: 528.9 KB)

Kestrel 5 Series specification chart

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

Kestrel 5 Series Troubleshooting Documents

How can I submit a tax-exempt order using the website? (Size: 1.2 MB)

Here is guidance on how to submit an order through the website for Tax Exempt customers.

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.

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.