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The Kestrel 4000 NV has the same features as his more colorful counterpart, but is 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 concerned 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.
The Kestrel 4500 NV Pocket Weather Tracker with digital compass and night vision preserving backlight is Kestrel's flagship meter. Capable of monitoring and reporting an exhaustive list of environmental parameters - from temperature to barometric pressure, dewpoint, wind chill, and more, the Kestrel 4500 is the most feature-rich pocket weather monitor in the entire Kestrel catalog.
In addition to the Kestrel 4200's extensive list of capabilities, the Kestrel 4500 has these distinct monitoring functions:
* Digital Compass
* Wind Direction
* Crosswind
* Headwind / Tailwind
These added features make the 4500 the Kestrel Meter of choice for military professionals, HAZMAT teams, and flight crews. Like all the pocket weather meters in the 4000 series, the Kestrel 4500 is capable of storing and charting up to 2000 data points for later analysis.
Weekend shooters and military snipers alike have been calling for a Kestrel Meter with crosswind calculation for years - and the Kestrel 4500 meets that demand completely. The elite Kestrel 4500 has the most complete list of features in the entire Kestrel Meter family, with the only absent elements being the airflow and humidity ratio measurements available with the Kestrel 4200 Air Flow Tracker.
Features
* Digital compass provides direction and stores data with wind speed
* Automatic Crosswind calculator
* Headwind/Tailwind speeds
* Current, Maximum and Average Wind Speeds
* Air, Water & Snow Temperature
* Wind Chill
* Relative Humidity
* Dewpoint
* Heat Stress Index
* Barometric Pressure
* Altitude Please go to barometer and altitude help for more information.
* Density Altitude
* Wet Bulb Temperature
* Graph and recall trends
* Easy to read, backlit display
* Time and date
* Customize screens to display user-selected measurements
* Flip-top impeller cover allows use of other functions while protecting the impeller (hard cases available.)
* Automatically store measurements, even when the unit is turned off
* Manually store measurements with the press of a button
* Chart up to 1,400 measurements
* Impeller can be replaced without tools
* Exterior temperature, humidity, and pressure sensors for fast and accurate readings
* Humidity sensor can be recalibrated in the field with our Relative Humidity Calibration Kit.
* Includes neck and wrist lanyards, protective pouch and 2 AAA batteries
* Waterproof and floats.
* 2-year warranty
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