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C9 Casting Microfinish Surface Comparator 
Make : GAR (Made in USA)

The C-9 Casting Microfinish Comparator Surface Roughness Scale provides industry with established flat-surface roughness specimens for visual and tactual comparison. It is used in specifying and controlling surface roughness when a product having the appearance of typically cast surface is required.

Procedure : Place the scale alongside your work piece. Slide the scale so that the rectangle with the surface roughness you want is adjacent to the piece you are examining. Compare by drawing the tip of the fingernail across each surface at right angles to the tool marks. The feel of the fingernail contact must be the same if the finishes are identical.