... portable metal hardness tester 1.Hardness Scale:HL,HB,HRB,HRC,HRA,HV,HS 2.Display:segment LCD MH180 portable metal hardness testerTechnical ... HS,(59-85)HRA,(13-100)HRBMeasuring direction:360°Hardness Scale:HL,HB,HRB,HRC,HRA,HV,HSDisplay: ... 2 AA size alkaline battery)Continuous working period:about 100 hours(With backlight off)Communication interface:RS232 MH180 portable metal hardness tester ...