Transit Time Clamp-on Ultrasonic Flow Meter The iSonic 2400W is a clamp-on ultrasonic flow meter that measures the flow of liquids and liquefied gases in a fully-filled pipe. It utilizes two clamp-on ultrasonic transducers installed on the external surface of the pipe, which work on the transit-time principle. This makes it non-invasive and non-intrusive, making it easy to use. It can cover a wide range of pipe diameters with two pairs of transducers. Additionally, it has an optional thermal en