... 2)High precision,easily read scale value from dial. HR-45M Manual Superficial Rockwell Hardness Tester adopts mechanical and ... instrument. Usage Range:Surface hardened steel, copper, aluminum alloy sheet, hard alloy steel, zinc layers, chrome layers, tin layers, ... and HRB Hardness Blocks.Picture ZonesAppearance of MITECH HR-45M Manual Superficial Rockwell Hardness TesterObjective Carrier for MITECH ...