... parts, fasteners, and other jeweler accessories(3) Main equipments: CNC lathe, Auto-lathe, meter lathe, pressing and forging machine, ... polishing equipment, etc.(4) Main inspection devices: digital projector, Rockwell hardness tester, hydraulic ... Acceptable Valve tester YD-3A50 1 2.0 Acceptable Micrometer 0-25mm 3 2.0 Acceptable Depth meter 0-200mm ...