Ultrasonic Thickness Gauge 1,measuring metal :steel, cast iron, aluminum, copper... 2,Measurement Range: (0.75 ~ 300) mm ... Ultrasonic Thickness Gauge1. Suitable for measuring metal (such as steel, cast iron, aluminum, copper, etc.), plastic, ceramic, glass, glass fiber ... case, certificate of inspection, operation instruction manual. LK300 Steel, Cast iron, Aluminum, Copper Ultrasonic Thickness Gauge