Economical Ultrasonic Thickness Gauge. Features. Our most economical ultrasonic thickness gauge includes 5Mhz dual sensor probe, couplant gel and carry case. . Model No. UTG-1500. State-of-the-art, digital tester is packed with features typically found on high-end models only. This multi-functional unit offers everything from basic measurement, Scanning Capabilities, Adjustable Sound Velocity, and visible memory function. This dynamic sonic gauge is designed to measure the thickness of metallic and non-metallic materials such as steel, aluminum, titanium, plastics, ceramics, glass, and any other good ultrasonic wave conductor as long as it has parallel top and bottom surfaces. The UTG-1500 will accurately display readings in either inch or millimeter after a simple calibration to a known thickness or sound velocity.