1. Pro AnemometerAccurately measure wind speed, wind temperature(℃/℉), air Velocity Flow Volume CFM CMM. Allows you to record 600 sets of readings, with portable case and easy to carry with you. 2. Precision Wind MeterWind speed measurement range: 0.001100 mph (accuracy: / 3%),displayed in 5 units: m/s, km/h, ft/min, knot, mph. Resolution: 0.001 miles.The Wind temperature 045℃(accuracy /1℃).Beaufort Wind Scale on the display, and which range is 018. 3. Air Flow CFM FlowmeterAir flow range: CFM 0999900 ft3/min, resolution: 0.001100, and even can measure the max/min/current/average/2/3max of the wind velocity.Professional air flow meter, used for CFM CMM measurement, A/C ducts,balance air flow in your HVAC system. 4. Easy to useAirflow tester with data hold, large backlit screen, easy to read even in darkness.Low battery indicator, remind you to the battery in time. Ideal weather monitoring for windsurfing, driving, RC drones, remote control aircraft, helicopters and quadcopters, shooting,etc.