The Skywatch® Wind measures wind speed, air temperature, and perceived temperature (wind chill) quickly and accurately.Small enough to be carried anywhere, dust and shock resistant, equipped with a user-replaceable propeller.Powered by a lithium battery, weight 30 g, dimensions mm 41x109x17, accuracy: ±3% FS.Available performances: 1) Instantaneous wind speed in knots, km/h, mph, m/s and maximum; 2) Temperature from -30° C to +70° C (-22° F to +158° F); 3) Apparent temperature based on wind speed, measurement range from 3 to 185 km/h.