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