30 Piece Specimen Comparator & Roughness

Item Name: Roughness Comparator (30 pcs/set)

Function and Features:

This set contains standards of the six most important machining methods in the prevalent “AA” values. The surface roughness is used to compare and determine the degree of the surface finish by comparison method and eye estimation or magnifying glass. The surface rough contrast blocks are made of 45 super carbon steel, except the GCr15, which is used to plate lapping the sample block. All 30 specimens are calibrated in µ”AA (Arithmetical Average) and in the metric equivalents µm Ra.