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Normally, the surface of the specimen to be tested must be prepared for Brinell hardness testing, because the surface quality must be good enough to allow correct optical evaluation of the indent.

Compared with the Vickers method, which also tests hardness in the micro range, the surface quality requirements for the Brinell method are nevertheless lower, because the latter normally involves testing with higher loads (in the macro range) and larger indenters (balls), so the surface can be rough.

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