H-2817—Easy to read face dial caliper with combination inch and metric scales features 0.001" / graduations and .100" per revolution. Hardened and ground stainless steel main beam with hardened, ground and lapped measuring faces. H-2817C—Same as H-2817, but includes calibration certificate H-2817M—Easy to read face dial caliper with combination inch and metric scales features 0.001" / 0.1mm graduations, hardened and ground stainless steel main beam with hardened, ground and lapped measuring faces.