Delta Ohm Anemometers Anemometer 626337 - Delta Ohm HD2903TC1.5, The Delta Ohm HD 2903 TC15 anemometer measures air speed from 0.05 to 20 m/s. This mass air flow meter is ideal for assessing wind force and air flow in various applications. Typical uses include monitoring environmental conditions and enhancing HVAC system efficiency. Delta Ohm HD2903TC1.5 Anemometer 0.05-20 m/s for Ventilation Ducts