Note: 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, ming it more difficult to detect with the ned eye in night operations.
This backlight appears soft greyish pink, not red, and is still in the visible spectrum, so it is not compatible with night-vision equipment. It tes 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 te place again. Light in the red spectrum does not cause this bleaching out, preventing night blindness and night vision fatigue. Kestrel Weather & Environmental Meters are designed & manufactured in the U.Innovatively designed for stability and accuracy in abrupt condition changes. Rugged and durable, Kestrels are drop tested, waterproof and designed to float if dropped in water. At OpticsPlanet, we pride ourselves on top-notch brand name products at some of the lowest prices on the internet! However, we know that we owe all our success to our valued customers. Whether you have a question about our products and policies, or you need any support placing, tracking or following-up on your order, we are always here to help! Sign up for our Newsletter. Subscribe to our newsletter to stay up to date with the latest products from OpticsPlanet. This item is in the category "Home & Garden\Tools & Workshop Equipment\Measuring & Layout Tools\Weather Stations". The seller is "opticsplanet" and is located in this country: US. This item can be shipped to United States.