Item Type: Anemometer Material: ABS Plastic Purpose: Anemometer, Measuring Temperature And Wind Speed Wind Speed Measurement: 0-30m/s Air Volume: CMM: 0-99.99m3/Min Range: CFM: 0-999900ft3/Min Working Humidity: Less Than 90%RH Working Temperature: -10 - +45 (14-122) Power Supply: 1 x 6F22 9V Battery (Battery Not Included) How to Use: First disassemble the rear power cover and insert the battery (not included), then close it tightly, press the red power button to turn on, the display will show the current ambient wind speed and temperature, press the power button again to turn on the back backlight; press up/min/ The maximum key can have three choices of upward, lowest and highest modes; press the set/hold key to enter the setting menu or enter the data saving mode; the lignt/enter key can turn on the LED light or confirm the function; the unit/down button can perform the wind speed unit Switch or select downward; vel/avg button can be used to measure average wind speed.