contracor src shot surface roughness comparatorAre you looking for a quick and easy way to measure surface roughness? Look no further than the SRC SHOT Surface Roughness Comparator. This precision nickel comparator plate conforms to International Standard ISO 8503 for grit and shot blast surface roughness comparison measurement. Comparators allow the estimation of surface roughness by touch and sight. They are split into four sections, each with a different and defined roughness. The shot version