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Available in the Night Vision Configuration

Military personnel and pilots flying in darkness are often concerned with preserving their night vision. Due to overwhelming demand from our military customers, the Kestrel NV line was added in 2005.

The Kestrel 4000N 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.

Kestrel 4000 Measures

• Barometric pressure
• Pressure trend
• Altitude
• Relative humidity
• Heat stress index
• Dewpoint
• Wet bulb temperature
• Density altitude
• Wind chill
• Air, water, and snow temperature
• Current wind speed
• Average wind speed
• Maximum wind gust

Kestrel 4000 Features

• Waterproof and floats
• Easy to read, backlit display
• Time and date
• 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.
• Minimum, maximum, and average values
• Automatically store measurements, even when the unit is turned off
• Manually store measurements with the press of a button
• Customizable data storage - 2000 data points
• Graph and recall trends
• Customize screens to display user-selected measurements
• Data charting
• Data upload (with optional interface)
• Five languages (English, French, Spanish, German, and Italian)
• User-replaceable impeller
• Flip-top impeller cover allows use of other functions while protecting the impeller
• US Patent Nos. 5,783,753 and 5,939,645 and 6,257,074
• All instruments and accessories are completely assembled in the USA
• 5-year warranty

Kestrel 4000 Includes

• Soft carry pouch
• Neck lanyard
• Batteries - 2 AAA
• Kestrel Certificate of Conformity