... hardness of dollars to upgrade products. The automatic turret digital hardness tester controlled by computer software, high-magnification optical ... hardness gradient. Technical parameter:ModelHZ-2504B automatic turret digital hardness testerMicro Vickers scaleHV0.01, HV0.025, HV0.05, HV0.1, HV0 ... .3, HV0.5, HV1 conver the scale to rockwell, ...