Profile: ATEQ Corp. is a manufacturer of leak testing and leak detection equipment. Our products include leak & flow testers, TPMS activator & testers, fast ID or OD seals, leak & flow calibrator, leak & flow standards, castings blockage test, pressure switch test, check valve & burst test and battery electrical test. There are different methods to measure air mass flow. Most use a hot element, like a hot wire, a hot pearl or a hot silicon chip, to measure the air flow. When the air flows around a hot element, it cools it down and the cooling down creates a change in electrical properties that is measured by electronics. The heat exchanged based air mass flow is inherently slow since it involves cooling down something with an air flow. Of course, the smaller the heating element is the faster it gets, and the larger the flow, the faster. The second disadvantage of heat exchange based mass flow measurement is that cooling down gives no direction to the flow.