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