The CO 7100 ultrasonic flowmeter offers economical flow measurement and quantity counting for clean, homogeneous liquids with low gas and solid contents. Two ultrasonic transducers are attached to the measuring point from outside by means of a mounting device. Each transducer sends and receives the sound pulses, which are digitally converted in the transducer. The data output in metric or US units is output to the PC via display, current and pulse output, and via an RS 232 interface.