GR3The Rockwell hardness tester was invented by Stanley P. Rockwell when he was in need of a fast, non-destructive instrument to test hardness.  The only testers he had were Scleroscope, Vickers, and Brinell.  Each one of these tests had their own disadvantages.  The scleroscope was difficult to use, the Vickers took too much time, and the Brinell had too large of indents for what he needed.  So, he decided to create his own hardness tester to eliminate all these disadvantages and ended up creating what we know today as the Rockwell hardness tester.

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