As the plans for more and more machined metal parts include numerical surface finish specifications, the need diminishes to visually qualify that a part has, for example, "a mirror finish with no burrs" or to have the machinist with the finest touch scratch the surface with his fingernail to make sure it's "matte and rough."
Source article: https://mfgaxis.com/press-releases/terms-of-the-trade-for-surface-roughness-measurement/
Company: Bruker Nano Surfaces
Press Release: Terms of the trade for surface roughness measurement
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