All you need to
know.

In the Brinell, Vickers and Knoop hardness testing methods, the hardness value must be determined by optical evaluation of the diagonals of the hardness test indent.

There are various options for optical evaluation of the indentation:

1. Evaluation by measuring magnifier
2. Evaluation by focussing screen and calliper gauge
3. Evaluation by camera system – state of the art

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