Profile: Airometrix Mfg., Inc. is a wholesaler, supplier and manufacturer of meters and measuring equipment. We provide Airometrix LP flow meter. Our LP meter is based on the principle of using multiple orifices of different sizes and known flow rates to quantify the air flow from a compressor. By opening valves to allow known flows to escape into the atmosphere, the LP meter acts as a load bank for the compressor. To test, isolate an air compressor from the system. Plumb the flow meter, so that the full flow of compressed air goes to the meter. Open the valves on the meter to allow known quantities of compressed air to escape into the atmosphere through the precision machined orifices.