This anemometer is portable and useful, it can measure wind speed and temperature, it can also show you wind scale and indicate wind chill. LCD screen with backlight, it is easy to read the value at night. Specifications: Air Speed: Range: 0 - 30 m/s, 0 - 90 km/h, 0 - 5860 ft/min, 0 - 65 mph, 0 - 55 knots Resolution: 0.1 m/s, 0 .3 km/h, 19 ft/min, 0.2 mph, 0.2 knot Threshold: 0.1 m/s, 0.3 km/h, 39 ft/min, 0.2 mph, 0.1 knot Accuracy: +/- 5% Air Temperature: Range: -10 - 45, 14 - 113F Resolution: 0.2, 0.36F Accuracy: 2, 3.6F Power: 1 battery 3V CR2032 (not included) Thermometer: NTC thermometer Operating temperature: -10~45 (14~113F) Operating humidity: less than or equal to 90% RH Storage temperature: -40~60, -40~140F Current Consumption: About 3mA Item Size: 105*40*18mm Item Weight: 50g Package List: 1 * Digital Anemometer 1 * Lanyard 1 * User Manual