... measurements on steel, cast iron, aluminum, red copper, zinc, quartz glass, polyethylene, PVC, gray cast iron and nodular cast iron. Thickness ... adjustable. FEATURES• Gauging for various materials such as metal, glass, plastic, rubber and etc.• Whole range of probes available ... Measurement Range:0.65 ~400mm(Steel),0.3~200mm(Glass)4~80mm(High temperature), 3~50mm(Gray Iron)Notes: ...