There is this huge misconception that profile of a surface is hard to measure. If profile is applied to an extremely complex surface, sure, it is a challenge - not because it is profile but because it is a complex surface. Profile of a surface relative to a datum reference frame, when applied to regular features is actually easier to measure …
Use Profile of a Surface Because it Is Easy to Measure (#174)
(In accordance with Y14.5M-1994 standard)
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