... -ferrous metal & hard alloy. BRINELL ROCKELL VICKERS HARDNESS TESTER MODEL HBRV-187.5 BRINELL ROCKWELL VICKERS HARDNESS TESTERFeature ... 294.2, 306.5, 588.4, 612.9, 980.7, 1471, 1839N (30, 31.25, 60, 62.5, ... MODEL HBRVU-187.5 BRINELL ROCKWELL VICKERS OPTICAL HARDNESS TESTER Feature & UseDirect reading from screen for Rockwell hardness ... 294.2, 306.5, 588.4, 612.9, 980.7, 1471, 1839N (30, 31.25, 60, 62.5, ...