General Tools WDCFM8912 Two-Piece Airflow Volume Anemometer-PsychrometerGeneral Tools WDCFM8912 The #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. Includes the replaceable #P8912 air speed temperature RH probe Min Max Avg memory + data hold Single and multi point