Optical Profilers
Finally, measurements of surface roughness and topography can be made for a price that's less than that of a stylus profilometer. The Profilm3D has sub-nanometer vertical resolution, which surpasses optical profilometers that cost 3x as much. It does so by using the same state-of-the-art measurement technologies as the most sensitive optical profilers available: vertical-scanning interferometry (VSI) and phase-shifting interferometry (PSI).
