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