Benetech GM100 Digital Ultrasonic Thickness Gauge Meter, Range 0.047 to 8.85in, for Measuring Metal and Nonmetal Aluminum, Zinc, Silver, Gold, Tin, Iron, Steel, Copper, PVC, Glass, Zirconium, Nylon: Amazon.com: Industrial & Scientific
Portable Ultrasonic Thickness Gauge Tester Meter with 0.75 to 600mm 0.03inch to 23.62inch (in Steel) for Metals Plastic Ceramics Testing Resolution 0.01mm: Amazon.com: Industrial & Scientific
Dakota MVX A/B Scope Ultrasonic Thickness Tester Gauge, Displays A Scan & B Scan