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. (read more)

This unit 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. (read more)

The Kestrel 4100 Pocket Air Flow Meter was engineered specifically with the HVAC technician's many needs in mind. In addition to measuring volume air flow, this multi-functional precision instrument also measures temperature, relative humidity and dewpoint, either ambient or in any accessible airflow. (read more)

The new Kestrel 4300 Construction Weather Tracker measures and displays evaporation rate — a function of relative humidity, temperature and wind speed. Evaporation rate is a critical environmental indicator that concrete contractors use to ensure they avoid plastic shrinkage cracks in concrete installations especially concrete flatwork. (read more)

The most comprehensive pocket weather meter on the market. For just under 4 ounces, you get every environmental reading with the press of a single button. The 4000 is unparalleled in its ease of use and totally customizable navigation and data display. In addition to measuring the current conditions, it tracks and stores up to 2000 sets of data. (read more)

The First Step to Optimizing Performance — Knowing the current environmental conditions can often be the difference between finishing in the money and just finishing. (read more)

Here's the one that started it all! The Kestrel 1000 Pocket Wind Meter was developed in 1995 when NK co-owner, Richard Kellerman, needed a reliable wind meter for flying his glider. Over 10 years later, it looks a little slicker, and it still gives you the reliable, accurate wind measurements that you need. (read more)

Here's the one that started it all! The Kestrel 1000 Pocket Wind Meter was developed in 1995 when NK co-owner, Richard Kellerman, needed a reliable wind meter for flying his glider. Over 10 years later, it looks a little slicker, and it still gives you the reliable, accurate wind measurements that you need. (read more)

NK was the first to provide accurate relative humidity measurements from a hand-held weather meter, and the Kestrel 3000 features two patents on its humidity measuring sensors. A testament to the 3000's accuracy: it's become practically required equipment for wildland firefighters—users whose lives literally depend on the accurate weather data their Kestrel 3000 provides. (read more)

For years customers have been asking for wind direction along with wind speed. New for 2007, the Kestrel 4500 does just that with its built in digital compass. But it doesn't stop there. It also calculates crosswind and headwind/tailwind with reference to a user-set target heading, and stores the information along with all the other environmental readings in its 1400 data point memory. (read more)