Christmas Best GiftOriGlam 0-30m/s LCD Digital Hand-held Wind Speed Meter & Thermometer with Vane Sensor Two functions in one unit, it supports air velocity and temperature measuring funcitons. With current / average / max air velocity measurement. There is a small fan in the head, when wind blows, it can test wind speed and rotate. 2 temperature unit selection, centigrade / fahrenheit degrees. 5 Units of air velocity: m/s, Km/h, ft/min, Knots, mph. LCD backlight display for operation under dark environment. With manual / auto power shut off function. Ideal tool for windsurfing, sailing, fishing, kite flying and mountaineering, also fit for industrial and home purpose such as measuring wind speed of air blower and temperature of CPU computer fans.