Hardness scale: HRA, HRB, HRC. Preliminary test force 10kg.
Test force: 60kg, 100kg, 150kg.
Load control manual.
Min. reading 0.1HR. Apply to large and heavy steel or iron workpieces.
With statistic function, display average, maximum and minimum values.
Convert to HV, HB and tensile strength.
According to ISO 6508, ASTM E18.
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