A clamp-on ultrasonic flowmeter is suitable for all commonly known pipe materials, whether ferrous, alloy or plastic.
Ultrasound flowmeters also work on pipes with an inner lining, provided the pipe is acoustically conductive and there are no layers of air between the different pipe materials.
Steel, stainless steel, asbestos cement, aluminum, copper, brass, lead, gray casting, ductile iron, nickel, tin, titanium, glass, polyethylene, PVC, CPVC, acrylic, …
This is just a small selection of the pipe materials suitable for ultrasonic flow measuring.