The ABM EasyHood captures air speed values from air supply or return/exhaust vents in residential or commercial buildings, and easily converts that into an airflow (volume) reading. To accomplish this, The ABM EasyHood is used with an ABM-200 Airflow & Environment Meter (or ABM-100 Airflow Meter and ABM-100 app) and a smartphone having the latest, free, CPS Link™ app installed.