... ,simple,easy to carry 4.3year warrant PHR portable pipe rockwell hardness tester HZ-2507C Equipment description:The PHR ... ,ASTM E18 ,ISO6508-1 Technical parameter:ModelHZ-2507C PHR portable pipe rockwell hardness testerHardness scaleRockwell—A , B , C , D , E ... iron, aluminum, magnesium alloy, bearing alloys.1/8 steel ballE100BAnnealed brass, copper, aluminum, mild steel sheet.1/16 steel ballF60BBronze, ...