A precision nickel comparator plate which 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.
Comparators are available in both grit and shot blasted versions.
The grit version is split into sections equivalent to 25, 60, 100 and 150 microns.
The shot version is split into sections equivalent to 25, 40, 70 and 100 microns.