Instruments for measuring surface roughness of ground, polished, super-smooth and diamond turned optics. Also measure textured surfaces, diffractives and step heights. Coherence Scanning Interferometers (CSI) also known as Scanning White Light Interferometers are non-contact instruments designed to quickly measure surfaces to high resolution with low measurement uncertainty. They are the ideal instruments for these applications as height resolution does not vary with field of view (FoV). We have instruments for demonstrations and measurement services. Contact us for more information.