Place the microfinish comparator surface roughness 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 mark
The feel of the fingernail contact must be the same if the finishes are identical
There are nine replicated cast surface finish specimens ranging from 20 to 900 microinches
The C-9 cast microfinish comparator is rectangular in shape (4 1/2"x 3 1/4") and is a corrosion resistant electroformed nickel duplicate of actual cast surfaces
Supplied in a leatherette case with engineering data and instructions
Gar Surface Roughness Scale C-9 Cast Microfinish Surface Comparator