Easy to handle and carry, specially built gages mounted hand contoured frame, thumb release mechanism, fast direct reading to .001", used to measure thickness of paper / cellophane / plastic film and metal plates, high-quality precision instrument, case finished in dull plated chrome, 52-550-005 and -020 measuring faces constructed in high grade tool steel, microfine graduation for .001" or .01mm minimum reading, features a thumb release mechanism, origin: Hong Kong.