Features: _x000D_ The digital multi-function anemometer is a professional instrument for measuring wind speed, temperature, and humidity. _x000D_ It is widely used for wind speed measurement in factory, school, office, traffic, family and many other various occasions. _x000D_ Measuring the wind speed, air volume, temperature and humidity. _x000D_ Measuring wind speed/air volume max/min value function. _x000D_ Air volume 2/3 MAX value, average value measurement. _x000D_ Wind speed/air volume and temperature unit selection function. _x000D_ Measuring wind direction angle function. _x000D_ Designed with USB for connection with computer and real-time measurement. _x000D_ Backlight and data hold function. _x000D_ Low battery indication function. _x000D_ Automatic power on/off setting function. _x000D_ _x000D_ _x000D_ Specification: _x000D_ Model: GT8907 _x000D_ Wind speed measurement range: _x000D_ Unit Wind speed range Resolution Minimum threshold value Precision _x000D_ m/s 0.0~45.0 0.01 0.3 3%0.1 _x000D_ Ft/min 0.0~8800 0.01/0.1/1 60 3%20 _x000D_ Knots 0.0~88.0 0.01 0.6 3%0.2 _x000D_ Km/h 0.0~140.0 0.01 1 3%0.4 _x000D_ Mph 0.0~100 0.01 0.7 3%0.2 _x000D_ _x000D_ Air volume measurement range: _x000D_ CFM: 0~999900 ft3/min_x000D_ CMM: 0~999900m3/ min_x000D_ Unit Range Resolution Area _x000D_ CFM(FT3/MIN) 0~999900 0.001~100 0.001~9999ft2 _x000D_ CMM(M3/MIN) 0~999900 0.001~100 0.001~9999m2 _x000D_ Unit conversion: _x000D_ m/s Ft/min Knots Km/h Mph _x000D_ 1m/s 1 196.87 1.944 3.60 2.24 _x000D_ 1 ft/min 0.00508 1 0.00987 0.01829 0.01138 _x000D_ 1 knot 0.5144 101.27 1 1.8519 1.1523 _x000D_ 1km/h 0.2778 54.69 0.54 1 0.6222 _x000D_ 1mph 0.4464 87.89 0.8679 1.6071 1 _x000D_ Air temperature: _x000D_ (1) temperature measurement range _x000D_ Unit Range Resolution Accuracy _x000D_ 0~45 0.1 1.0 _x000D_ 32~113 0.18 1.8 _x000D_ (2) Humidity measurement range _x000D_ Unit MIN/MAX Resolution Precision Test condition _x000D_ %RH 10-90 0.1 5% 90%RH without condensation _x000D_ _x000D_ Working current: _x000D_ Unit Description MIN/MAX TYP Test condition _x000D_ mA Working current 1: 15~20 18 backlight is off _x000D_ mA Working current 2: 20~25 23 backlight is on _x000D_ V Low battery indication 3.5 ~ 4.5 4 _x000D_ uA Power off current 0~8 5 _x000D_ Working environment: _x000D_ Temperature 0~5 (32~122) _x000D_ Humidity 40~80%RH _x000D_ Storage condition: _x000D_ Temperature -40~60(-40~140) _x000D_ Humidity 80%RH _x000D_ Power supply: 4x 1.5V AAA alkaline batteries (NOT included) _x000D_ Weight: 1214 g / 42.8 oz(approx.) _x000D_ _x000D_ _x000D_ Package list: _x000D_ 1 * Anemometer