GT8907 Precise Digital USB Anemometer Multifunction Wind Speed Temperature Air Flow Tester Features: The digital multi-function anemometer is a professional instrument for measuring wind speed, temperature, and humidity. It is widely used for wind speed measurement in factory, school, office, traffic, family and many other various occasions. Measuring the wind speed, air volume, temperature and humidity. Measuring wind speed/air volume max/min value function. Air volume 2/3 MAX value, average value measurement. Wind speed/air volume and temperature unit selection function. Measuring wind direction angle function. Designed with USB for connection with computer and real-time measurement. Backlight and data hold function. Low battery indication function. Automatic power on/off setting function. Specification: Model: GT8907 Wind speed measurement range: Unit Wind speed range Resolution Minimum threshold value Precision m/s 0.0~45.0 0.01 0.3 ±3%±0.1 Ft/min 0.0~8800 0.01/0.1/1 60 ±3%±20 Knots 0.0~88.0 0.01 0.6 ±3%±0.2 Km/h 0.0~140.0 0.01 1 ±3%±0.4 Mph 0.0~100 0.01 0.7 ±3%±0.2 Air volume measurement range: CFM: 0~999900 ft³/min CMM: 0~999900m³/ min Unit Range Resolution Area CFM(FT³/MIN) 0~999900 0.001~100 0.001~9999ft² CMM(M³/MIN) 0~999900 0.001~100 0.001~9999m² Unit conversion: m/s Ft/min Knots Km/h Mph 1m/s 1 196.87 1.944 3.60 2.24 1 ft/min 0.00508 1 0.00987 0.01829 0.01138 1 knot 0.5144 101.27 1 1.8519 1.1523 1km/h 0.2778 54.69 0.54 1 0.6222 1mph 0.4464 87.89 0.8679 1.6071 1 Air temperature: (1) temperature measurement range Unit Range Resolution Accuracy ℃ 0~45 0.1 ±1.0℃ ℉ 32~113 0.18 ±1.8℉ (2) Humidity measurement range Unit MIN/MAX Resolution Precision Test condition %RH 10-90 0.1 ±5% 90%RH without condensation Working current: Unit Description MIN/MAX TYP Test condition mA Working current 1: 15~20 18 backlight is off mA Working current 2: 20~25 23 backlight is on V Low battery indication 3.5 ~ 4.5 4 uA Power off current 0~8 5 Working environment: Temperature 0~5℃ (32~122℉) Humidity 40~80%RH Storage condition: Temperature -40~60℃(-40~140℉)