... 3.high accuracy,low cost 4.3 years warranty Protable rockwell hardness gauge HZ-2507A Equipment discription:PHR Series ... at the end of 2006. Technical parameter:ModelHZ-2507A PHR Protable rockwell hardness gaugeHardness scaleRockweel—A, B , C , D , E ... , F , G , H , KSuperficial rockwell—15N , 30N , 45N , 15T , 30T , 45TTest forceRockwell—Preliminary ...