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Description: GM816A Digital LCD Handheld Air Wind Speed Meter Anemometer Thermometer Tester Measure Velocity Features: Used to measure the air velocity and temperature. Two temperature units available: Centigrade and Fahrenheit. Five air velocity units available: m/s, km/h, ft/min, Knots, mph. Quick response with external thermistor. With maximum, average and current air velocity measurement. With Beaufort scale shown on the screen. Wind chill and low battery indication. LCD display with backlight. Automatic and manual power-off. Specifications: Air Velocity: Range: 0 - 30m/s, 0 - 90km/hr, 0 - 5860ft/min, 0 - 65mph(5%) 0 - 55Knots Resolution: 0.2C, 0.2m/s Accuracy: 5% Auto power off 14 minutes without any operation Air Temperature: Range: -10 45C, 14 113F Resolution: 0.2C, 0.36F Accuracy: 2C, 3.6F Thermometer: NTC Thermometer Operating Temperature: -10~+45C (14~113F) Power Supply: one 9V 6F22 battery (Not included) Operating Humidity: less than or equal to 90%RH Storage Temperature: -40~60C, -40~140F Current Consumption: About 3mA Item Size: 52.5x35.5x160 mm Weight: 187g Package included: 1 x GM816A Digital LCD Air Wind Speed Meter 1 x User Manual (English) Details pictures: