This anemometer is portable and useful which can measuring wind speed and temperature, it also can show you wind scale and indicate windchill. LCD display with backlight, it is easy to read value at night. Features: Measure wind speed and temperature. Large easy-to-read LCD display with backlight. Wind speed in Beaufort wind scale bar graph. Wind chill indication. Data hold function. High precision pressure sensor. Quick response, external thermistor. Auto/manual power off. Temperature display in /F. Wind speed range: 0-30m/s Wind temperature range: -10 - 45 (14-113F) Current/max/average wind speed reading. Wind speed unit: m/s, Km/h, ft/min, Knots, mph. Powered by a 3V CR2032 battery. Specifications: Air Velocity: Range: 0 - 30m/s, 0 - 90km/h, 0 - 5860ft/min, 0 - 65mph, 0 - 55Knots Resolution: 0.1m/s, 0.3km/h, 19ft/min, 0.2mph, 0.2Knots Threshold: 0.1m/s, 0.3km/h, 39ft/min, 0.2mph, 0.1Knots Accuracy: +/- 5% Air Temperature: Range: -10 - 45, 14 - 113F Resolution: 0.2, 0.36F Accuracy: 2, 3.6F Power Supply: 1 * 3V CR2032 battery (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