Ultrasonic Thickness Gauge 1,measuring metal :steel, cast iron, aluminum, copper... 2,Measurement Range: (0.75 ~ 300) ... Ultrasonic Thickness Gauge1. Suitable for measuring metal (such as steel, cast iron, aluminum, copper, etc.), plastic, ceramic, glass, glass fiber ... function, can real-time display battery remaining power.8. Auto dormancy, shutdown and auto power etc. saving function.9. With RS232 ...