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Cut-off: The wavelength at which a filter becomes effective.Software can perform mathematical filtering. The measurement system is a mechanical filter. Filter: A process to exclude wavelengths above or below a particular frequency.Not to be confused with Waviness or Form, which have longer wavelengths. Roughness: A quantitative measure of the process marks produced by the creation of the surface and other factors such as the structure of the material. In any discussion of this type, we need to start with a few definitions. However, getting the “correct” result depends critically on the selection of a number of parameters that can be set by the metrologist. The mathematical definition of Surface Roughness parameters is very strictly defined by international standards. An Introduction to surface roughness measurement