VTSYIQI TUF-2000M-TS-2 Ultrasonic Flow Meter with Power Adapter DN15-100mm 0.59-3.93in Clamp On Transducers Flowmeter: Amazon.com: Industrial & Scientific
Clamp On Ultrasonic Gas Flow Meters
FP-4400 Portable Clamp-on Ultrasonic Flow Meter - ONICON Flow and Energy Measurement