... ,HRB,HRC,HRA,HV,HS 2.Display:segment LCD MH180 portable metal hardness testerTechnical Specifications:Measuring range: (170-960)HLD,(17 ... ,HV,HSDisplay:segment LCDData memory:max. 100 groups(relative to impact times 32~1)Working voltage:3V(2 AA size alkaline ... :about 100 hours(With backlight off)Communication interface:RS232 MH180 portable metal hardness tester