nprofile1qyt8wumn8ghj7un9d3shjtnyd968gmewwp6kytcqyz6v2rsmc8tufcfh95x8vlz8q4gf7pctpucsj3rajrxsav62ny5fv528eua (nprofile…8eua) a Vickers hardness tester is a standard piece of metallurgy/metrology lab kit. It has a pointy diamond that gets pressed into metal. The bigger the indent, the softer the metal
So they did this with mechanical engineering.