... the test piece is available for many different materials including steel, cast iron, aluminum, red copper, brass, zinc, quartz glass, ... life. Function1. Applicable to measure the thickness of any hard materials, e.g. steel, castiron, aluminum, red copper, brass, zinc, quartz ... matrix LCD with EL backlight.Measuring Range0.75~300mm (in Steel)Sound Velocity Range1000~9999 m/sResolution0.1mm0.1/0.01mm ...