The hardness tester is appropriate for hard alloy, carbide, the surface of hardened steel, hardened sheet metal ROCKWELL HARDNESS ... shape, combinating of common superficial Rockwell hardness tester and superficial Rockwell Hardness Tester , expanding the scope of use, ... .The hardness tester is appropriate for hard alloy, carbide, the surface of hardened steel, hardened sheet metal, hardened steel ...