... simple appearance, it uses as popular type Rockwell Hardness testing instrument. Usage Range:Surface hardened steel, copper, aluminum alloy ... ScalesHR15N, HR30N, HR45N, HR15T, HR30T, HR45TInitial Testing Force3kgf (29.42N)All Testing Force15kgf (147.1N), 30kgf (294.2N), 45kgf ... Hard Alloy Steel Ball Indenter, Large Testing Table , Medium Testing Table and Vshaped Testing Table, HRC and HRB Hardness ...