A CFM meter, or cubic feet per minute meter, is an important tool for HVAC (Heating, Ventilation, and Air Conditioning) technicians. It is used to measure the rate of air flow in a system, and is a key component in ensuring that the system is operating correctly. CFM meters measure the velocity of air flow, as well as the volume of air that is passing through a given area. This information is essential for HVAC technicians, as it allows them to determine the amount of air that is needed to be supplied to a given area in order to maintain a comfortable temperature. Additionally, it can be used to detect any blockages or obstructions in the system, as well as to identify any potential problems that may be present. In short, a CFM meter is an invaluable tool for HVAC technicians, and is essential for ensuring that a system is running optimally.