Kestrel 4400NV Heat Stress Tracker in Desert Tan
Detects when heat-related conditions are not safe, even before your body does. This model is being discontinued.
Kestrel 4400NV Heat Stress Tracker in Desert Tan Overview
The Kestrel 4400NV Heat Stress Tracker provides waterless WBGT measurement. Until now, most accurate WBGT measurement tools were large, cumbersome to use (requiring the transport of distilled water along with the measurement unit) and/or expensive. Kestrel added a compact black globe thermometer to the already proven sensor suite of the Kestrel 4000 Weather & Environmental Meters, then built in advanced algorithms to calculate WBGT values within 2.18 deg C of the values obtained from a full-sized WBGT setup.
Note: This Kestrel has a night-vision preserving backlight which helps users to sustain natural night vision. The NV's backlight incorporates an optical filter to reduce overall brightness and minimize blue and green spectrum light to preserve night vision. Additionally, NV backlights are also much dimmer than a standard backlight, making it more difficult to detect with the naked eye in night operations. This backlight appears soft greyish pink, not red, and is still in the visible spectrum, so is not compatible with night-vision equipment.
It takes 30 to 45 minutes for the average eye to adapt to darkness and maximize night vision. Even a short burst of white, yellow, green or blue light “bleaches out” the rod cell photoreceptors in the eye and causes night blindness until the entire adaptation process can take place again. Light in the red spectrum does not cause this “bleaching out”, preventing night blindness and night vision fatigue.
Includes: Kestrel Portable Vane Mount, Belt Carry Case, Neck Lanyard, 2 AAA Lithium Batteries (average life 400 hours) and Kestrel Certificate of Conformity.
Kestrel Weather & Environmental Meters are designed & manufactured in the U.S.A and are backed by our 5-year warranty. Innovatively designed for stability and accuracy in abrupt condition changes. Rugged and durable, Kestrels are drop tested, waterproof and designed to float if dropped in water.