Item Type: Anemometer Material: ABS Wind Speed Measurement Range: 0.0-45.0m/s 0.0-8850Ft/min 0.0-87.5Knots 0.0-160.0Km/h 0.0-100Mph Wind Volume Measurement Range: CFM: 0-999900 Ft3/min CMM: 0-999900m3/min Wind Temperature Measurement Range: 0-45 32-113 Humidity Measurement Range: 10-90%RH Power Supply: 4 x 1.5V AAA Alkaline Battery (Battery Not Included) How to Use: 1: The wind speed probe handle is connected to the host. 2: Install 4 x 1.5V AAA dry battery (this product does not include) 3: Press the power on, short press the power button for 2s to backlight, UNIT unit switching, AREA/SAMPLE recording time interval, VEL/FLOW wind speed and air volume switching, READ reading and storing recording interface, REC keeping data once, DEL deleting data interface, Maximum/Minimum values, ENTER confirmation button 2/3V Maximum, HOLD data retention