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👉【Pro Wind Speed and Airflow Meter】The Air Velocity Tester is designed with pro low friction bearing, which can test wind sensitively. Wind Speed Range: 0.3~45m/s(+/- 3%+0.1 reading, Resolution: 0.001m/s). 5 units: m/s, km/h, ft/min, knots, mph. Wind Temperature: 0~45℃ (℃ or ℉ switchable) 👉【CFM/CMM Air Flow Meter】Wind flow range: CFM 0-999900 ft3/min (Resolution: 0.001-100). Air flow area : 0.001-9999 ft2. You can just set the cross sectional area of the register or vent, the air volume will display in CFM/ CMM synchronously during the air flowing measurement. Suitable for the testing and maintenance of HVAC Duct, LEV & Ventilation 👉【Data Hold & Logging】The professional anemometer measure air velocity in 5 measurement modes: Maximum, Minimum, (2/3) Max, Average, and Real-time. It also supports one-click data freeze and 600 groups measurement data storage for further analysis 👉【Split Type Vane Anemometer】The extension cord of the wind velocity sensors can be extended up to 2 m. It is convenient to monitor home ventilation / HVAC system over head and test the workshop dust collection system in the woodworking. Additionally, the 1.69 x 2.36 inch Backlit LCD display helps you read the data easily 👉【Multifunctional HVAC tool】Low battery indicator reminds you to replace the battery in time. The Industrial Wind Velocity Sensor will automatically shut down after 5min of inactivity or when the wind wheel is stationary, thereby extending battery life