Check out this handheld Microprocessor-controlled Ultrasonic Thickness Meter. It is designed to measure the thickness of kinds of metal and non-metallic
material such as aluminum, titanium, plastics, glass and other good
ultrasonic wave conductors, the gauge can match probes of different
frequencies with high power of emission and broad band of receiving
sensitivity. That makes it easy to measure the rough surface, even cast
iron. It is widely used in almost all fields of industries. It features
instant results that's clearly & legibly shown on an easy-to-read
LCD screen and exact reading with no guessing or errors.