... ,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- ... :about 100 hours(With backlight off)Communication interface:RS232 MH180 portable metal hardness tester