How To Distinguish CNC machining Surface Roughness Between 6.3 And 0.8?

It is our common method to measure the roughness of the cnc machined surface of parts with a roughness meter, but do you know how to "measure" the surface roughness of parts with a roughness compariso...

Surface Roughness CNC machining Milling Lathe End mill

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3 Engineer 1
4 Pete Dudash 1
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