Multifunctional Anemometer: Wind speed range:1~65 Mph; Accuracy: +/-5% 5 speed units: m/s km/h ft/min knots Mph; 2 temperature units: Degree Celsius/Fahrenheit(/). This wind velometer suits for home field HVAC installation CFM calculation and duct vents maintenance. Wide Applications: Installed with loads of functions: wind chill indication MAX/MIN/AVG measurement switchable units this air velocity indicator measuring wind velocity and temperature accurately works well in weather prediction outdoor activities drone flying boat sailing fishing shooting. Low Friction Impeller: Wind speed in Beaufort wind scale bar graphwhich range 0-12.Thanks to 8 sensitive lightweight blades rotating smoothly indoor and outdoor this wind volume reader can keep track of current averagemaximum or minimum breeze down to 0.2 Mph in real time. Handy Screw Hole Design: Built-in metal screw hole at the bottom AN-100 wind meter frees your hands from long-time holding during outdoor activities operating. Solid wrist strap and high quality protective case (Included) enable you to take the wind velocity meter outside easily. Continuous Measurement Support: In case of long-time wind gauge this airspeed meter is manual/ auto power off after 15 minutes optional. Fix it on tripod with the metal threaded hole(Tripod NOT included). We provides 12 months product warranty and life-time tech support.