Item Type: Digital Anemometer Material: ABS Model: 8907 Battery: 1.5V 4xAAA (not included) Uses: Flying kites, aviation planes, drones, sailing, fishing, hiking, shooting, etc. Basic parameters: 1. Wind speed measurement range: UnitWind Speed RangeResolutionLowest Starting PointAccuracy m/s0.0~45.00.010.33%0.1 Ft/min0.0~88000.01/0.1/1603%20 Knots0.0~88.00.010.63%0.2 Km/h0.0~140.00.0113%0.4 Mph0.0~1000.010.73%0.2 2. Air volume measurement range: CFM0-999900ft^3/min CMM0-999900m^3/min UnitRANGERESOLUTIONAREA CFM(FT^3/MIN)0-9999000.001-1000.001-9999ft^2 CMM(M^3/MIN)0-9999000.001-1000.001-9999m^2 3. Unit conversion: m/sFt/minKnotsKm/hMph 1m/s1196.871.9443.60 2.24 1ft/min0.0050810.009870.018290.01138 1knots0.5144101.2711.85191.1523 1km/h0.277854.690.5410.6222 1mph0.446487.890.86791.60711 4. Wind temperature: (1) Temperature measurement range UnitGearResolutionAccuracy 0~450.11.0 32~1130.181.8 (2) Humidity measurement range UnitMinimum/MaximumResolutionAccuracyTest conditions %RH10~900.15%90%RH non-condensing 5. Working current: UnitDESCRIPTIONMinimum/MaximumTYPTest conditions mAWorking current 115~2018Backlight is off mAWorking current 220~2523Backlight is on VLow battery indicator3.5~4.54 uAshutdown current0~85 6. Working environment: Temperature0~50 (32~122) Humidity40~80%RH 7. Storage environment: Temperature -40~60 (-40~140) Humidity80%RH