portable hardness tester 1.Pass ISO 9001 2.Size:230 X 90 X ... .Continuous Working time:About 100h SH-310 LEEB HARDNESS TESTER Product ModelLeeb hardness tester SH310 Technical SpecificationHardness scaleHL, HRC, HRB, HRA, HV ... Impact DeviceDOptional Impact DevicesDC, D+15, G, C, DLPowerRechargeable Li-ion BatteryContinuous Working timeAbout 100h, (without printing and backlight)Charging time2 ...