Do you want to measure air velocity (wind speed) and temperature? You may try this anemometer whether you re flying planes drones helicopters. It s very useful and widely used in hiking sailing pilot ventilation system sea sport competition wind marine industry exhaust fans air-conditioning etc. Features: 2 in 1 digital anemometer for measuring air velocity(wind speed) and temperature. With maximum average and current air velocity measurement with beaufort scale. 6 wind speed units selection: m/s ft/min Knots Km/h mph bft and temperature units ℃/℉ selection. Large LCD display with backlight for easy operation in darkness. Perfect for home and uses. Low battery indication wind chill indication auto/manual off & energy saving. Specifications: Color: Black + Red Material: ABS Switchable Wind Speed Unit: m/s Knots Km/h mph ft/min bft : 0～30m/s 0～90Km/h 0～55Knots 0～65mph 0～5860ft/min Resolution: 0.1m/s 0.3Km/h 0.2Knots 0.2mph 19ft/min Minimum Wind Speed: 0.7m/s 2.5Km/h 1.4Knots 1.6mph 137ft/min Air Velocity Accuracy: ±5% Temperature : -10 ～ 45℃ / 14 ～ 113℉ Temperature Resolution: 0.2℃ / 0.36℉ Temperature Accuracy: ±2℃ / ±3.6℉ Auto Off: 14 minutes without any operation Thermometer: NTC Thermometer Operating Conditions: -10℃～45℃ / 14℉～113℉ ＜90%RH Storage Conditions: -40℃～60℃ / -40℉～140℉ Display: LCD Display with Backlight Battery: 1 * 3.0V CR2032 Button Cell (Not Included) Current Consumption: Approx.3mA Item Size: 47 * 21 * 126mm / 1.9 * 0.8 * 5.0in Item Weight: 86g / 3.0oz Package Size: 13 * 5.9 * 3.5cm / 5.1 * 2.3 * 1.4in Package Weight: 102g / 3.6oz Package List: 1 * Digital Anemometer 1 * User Manual (English)