... ,HRB,HRC,HRA,HV,HS 2.Display:segment LCD MH180 portable metal hardness testerTechnical Specifications:Measuring range: (170-960)HLD,(17 ... -68.5)HRC,(19-651)HB,(80-976)HV, (30-100)HS,(59-85)HRA,(13-100 ... :about 100 hours(With backlight off)Communication interface:RS232 MH180 portable metal hardness tester