Chromatic confocal method for optical measurement technology for measuring distance and thickness has been established as one of the mature methods available to industry and research. Incident white light is imaged through a chromatic lens to yield a continuum of monochromatic light along the z-axis, thereby “colour coding” the optical axis. When an object is present in this colour field, a single wavelength is fixed to its surface and then reflected back to the optical system. The backscattered beam passes through a filtering pinhole and is then acquired by a spectrometer. The beam’s specific wavelength is calculated to precisely determine the position of the surface in the measurement field. Chromatic confocal technology allows reliable, accurate and reproducible dimensional measurements with high resolution.