Thermal mass flow meter is a kind of air or compressed air flow meter with flow units CFM.
Most flow meters to get compressed air mass flow rate need to measure the mass of the flow and need extra devices to measure pressure and temperature, so that mass flow and density can be calculated.
However, the thermal mass air flow meter directly measures the air mass flow. Hence it is not affected by the changes in temperature and pressure. Thus the mass flow meter gives more accurate, reliable and repeatable readings than other meters. It also has more rangeability than other flow meters.