The Kestrel 2500NV has an easy-to-use altimeter and 3-hour pressure trend!
The Kestrel 2500NV 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.
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.