Check the listing for details. Pro HVAC Anemometer CFM Wind Speed Gauge Temperature Air Flow Velocity Meter LCD. Condition: New. Listed at 52.88 USD. ➤【Pro Air Flow CFM Anemometer 】Accurately measures wind velocity in 5 units: m/s, km/h, ft/min, knots, mph. wind temp in ℃/℉ , air flow in CFM CMM. Allows you to record 600 groups of wind data, and comes with carrying storage case that provides good protection and keep everything together. ➤【Higher Range Wind Speed Meter 】Higher Wind Speed Range: 0.001~100 mph (Accuracy: +/- 3% +/- 0.2 reading), Resolution: 0.001. Air temperature range 32.0-113.0 ℉(0~45℃), Resolution 0.1. And also provides Current, Max, Min, 2/3 Max, Average of wind velocity, wind flow readings ➤【Airflow CFM Meter】BT-846A wind speed gauge measures 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 wi.