The E-9 EDM MICROFINISH COMPARATOR is rectangular in shape (7/8″ x? 5″) and is a corrosion resistant electroformed nickel duplicate of actual electrical discharge machined surfaces.
There are nine replicated EDM surface finish specimens ranging from 16 to 250 microinches.
The E-9 MICROFINISH COMPARATOR is supplied in a leatherette case with engineering data and instructions
The E-9 is also available in metric with micrometer designations.
Made in U.S.A