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 and other any ... of inspection, operation instruction manual. LK300 Steel, Cast iron, Aluminum, Copper Ultrasonic Thickness Gauge