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An ultrasonic flow meter (ultrasonic flowmeter) is a type of flow meter that measures the velocity of a fluid with ultrasound to calculate volume flow. There are three different types of ultrasonic flow meters. Transit-time flow meters can be distinguished into in-line (intrusive, wetted) and clamp-on (non-intrusive) varieties. Ultrasonic flow meters that use the Doppler shift are called reflection or Doppler flow meters. The third type is the open-channel flow meter. GAIMC is specialized in transit-time ultrasonic flow meter.