- General Tools DAF3009 Mini Digital Airflow Meter is a compact, versatile airflow meter. General Tools DAF3009 easily measures air speed, temperature,and wind chill. Other functions of the DAF3009 are measurements of air volume in CFM and CMM, in addition to dew point readings and BTU. The DAF3009 also features a large back-lit screen, as well as an anti-slip hand grip.








