Greyline Flow Meter Ultrasonic | Portable Ultrasonic Flow Meter The PTFM 1.0 ultrasonic transducers clamp-on the outside of pipes from 2″ to 48″ (50 to 1200 mm) diameter. The ultrasonic signal works through common pipe materials including carbon steel, stainless steel, ductile iron, cast iron, PVC, PVDF, fiberglass, copper, brass, aluminum, and pipes with bonded liners […]