8907 Digital Anemometer High Accuracy Wind Speed Volume Temperature Meter Tester Gauge 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: Unit Wind Speed Range Resolution Lowest Starting Point Accuracy 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 2. Air volume measurement range:CFM：0-999900ft^3/minCMM：0-999900m^3/min Unit RANGE RESOLUTION AREA CFM(FT^3/MIN) 0-999900 0.001-100 0.001-9999ft^2 CMM(M^3/MIN) 0-999900 0.001-100 0.001-9999m^2 3. Unit conversion: m/s Ft/min Knots Km/h Mph 1m/s 1 196.87 1.944 3.60  2.24 1ft/min 0.00508 1 0.00987 0.01829 0.01138 1knots 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 4. Wind temperature: (1) Temperature measurement range Unit Gear Resolution Accuracy ℃ 0~45 0.1 ±1.0℃ ℉ 32~113 0.18 ±1.8℉ (2) Humidity measurement range Unit Minimum/Maximum Resolution Accuracy Test conditions %RH 10~90 0.1 ±5% 90%RH non-condensing 5. Working current: Unit DESCRIPTION Minimum/Maximum TYP Test conditions mA Working current 1 15~20 18 Backlight is off mA Working current 2 20~25 23 Backlight is on V Low battery indicator 3.5~4.5 4 uA shutdown current 0~8 5 6. Working environment: Temperature 0~50℃ (32~122℉) Humidity 40~80%RH 7. Storage environment: Temperature  -40~60℃ (-40~140℉) Humidity ≤80%RH