The Kestrel 2500, 3500 and 4000 were improved to make them even more suitable for night-time activities. The Kestrel NV units are olive drab with a visible red backlight, which helps sustain the user's natural night vision. Military personnel and pilots flying in darkness are often concerend with preserving their night vision.
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. The units' red backlight is also much dimmer than a standard backlight, making it more difficult to detect with the naked eye in night operations.
Kestrel 2500NV
The Kestrel 2500NV has an easy-to-use altimeter and 3-hour pressure trend! Note: This unit has a RED Backlight.
Measures
Current Wind Speed
Maximum Wind Gust
Average Wind Speed
Air, Water & Snow Temperature
Wind Chill
Barometric Pressure
Altitude
Kestrel 3500NV
The Kestrel 3500 measures every environmental condition simply with the press of a button! Note: This unit has a RED Backlight.
Measures
Current Wind Speed
Maximum Wind Gust
Average Wind Speed
Air, Water & Snow Temperature
Wind Chill
Relative Humidity
Dewpoint
Heat Stress Index
Barometric Pressure
Altitude
Wet Bulb Temperature
Kestrel 4000NV Pocket Weather Tracker
The Kestrel Tracker is the next generation of weather monitoring. You can now measure EVERY major environmental condition, easily and accurately, right in the palm of your hand. The chart mode allows users to recall and graph up to 2000 measurements, along with the date and time of storage. Barometric Pressure, Altitude, Density Altitude, Temperature, Humidity, Wind Speed, Wind Chill, Dew Point, Wet Bulb, and Heat Index... all in one pocket sized instrument. Note: This unit has a RED Backlight.
