Two-Piece Airflow Volume Anemometer
The General Tools WDCFM8912 airflow volume anemometer is designed to measure the output of exhaust fans and blowers. Its vane-style probe can detect air moving as slowly as 60 ft./min (0.3 m/sec). The meter also measures or calculates airflow volume, relative humidity, and ambient, Dew Point and Wet Bulb temperatures.