How to measure the surface hardness?
The surface hardness must be measured with a micro hardness tester. In Eldracher those equipments are the FM-800 model of the Future-Tech Corp. brand and they are calibrated annually.
There is a frequent mistake that must be avoided, which is trying to measure the surface hardness with a penetration hardness tester, since the hardness we would be measuring would be the one in the core and not the one in the surface.
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