The Kestrel 4500NV 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 4500NV Measures...

• Heading (true & magnetic)
• Wind direction
• Crosswind
• Headwind/tailwind
• Altitude
• Pressure trend
• Barometric pressure
• Wet bulb temperature
• Relative humidity in %
• Heat stress index
• Dewpoint
• Wet bulb temperature
• Density altitude
• Wind chill
• Air, water, and snow temperature °F or °C
• Current, average, and maximum air velocity

Kestrel 4500NV Features...

• Waterproof and floats
• Time and date
• Easy- to-read backlit display
• Data Logger (automatic and manual)
• Customizable data storage - 1400 data points
• Minimum, Maximum and Average values
• Multi-Function 3-line display
• Exterior temperature, humidity, and pressure sensors for fast and accurate readings
• Customize screens to display user-selected measurements
• Graph and recall trends
• User-replaceable impeller
• Flip-top impeller cover allows use of other functions while protecting the impeller
• Data charting
• Upload to a computer (with optional interface)
• NIGHT VISION - adapted backlight for preserving eyesight at night
  
• Five languages (English, French, Spanish, German, and Italian)
• US Patent Nos. 5,783,753 and 5,939,645 and 6,257,074
• 5-year warranty
• Assembled in the USA

The Kestrel 4500NV Includes...

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

Kestrel Reliability and Quality is Backed by a 5-Year Warranty.

Specifications

Dimensions:
5.0 x 1.8 x 1.1"
12.7 x 4.5 x 2.8 cm

Weight:
3.6oz / 102g

5 year warranty

Made in the USA