The Elcometer 129 Surface Comparators are available in two models:
Elcometer 129 Rubert - available in grit and shot versions
Elcometer 129 Rugotest - shot and grit profiles on the same block
Roughness is displayed in both "classes" and "roughness averages" for easier identification. Available in Metric only.
6 Roughness Values per Comparator.