... Test the surface Rockwell hardness of steel, alloy steel, hard alloy, electroplating layer and carburizing, nit riding. 1) The hardness tester can be ... used to test the surface Rockwell hardness of steel, alloy steel, hard alloy ... indenter: one 3. V-shaped testing bench: a standard Rockwell hardness block: five Rockwell Hardness Tester HR-150A