Microfinish Comparator Surface Roughness Scales provide the industry with established flat surface roughness specimens for visual and tactual comparison. They are used in specifying and controlling surface roughness when comparison and evaluation to a product having the appearance of typically machined surfaces are required.
Place the Microfinish Comparator Surface Roughness Scale next to 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 mark. The feel of the fingernail contact must be the same if the finishes are identical.