HFBTE Ultrasonic Thickness Gauge Tester Meter for Metal (Such As Steel Cast Steel Aluminum) Plastic Glass Fiber Glass Etc with Measuring Range 0.75 to 400 mm/0.03 to 15.74 Inch: Amazon.com: Industrial & Scientific
TI-45NA - Ultrasonic Wall Thickness Gauge kit with 5MHz 10 mm diameter probe
Handheld Ultrasonic Pipe Thickness Gauge, Through Coating | ATO.com