Dental colour measurement made easy - fast, accurate and reliable The patented colour measuring instrument consists of a spectrophotometer controlled by a Linux machine. Zfx Shade is user-friendly and compatible with Microsoft Windows. The spectrophotometer is equipped with LED lighting; for each measured wavelength another LED type is used. If the measuring button is pressed, the light source illuminates the entire spectrum of the visible light at short intervals. The colours are guided along a light conductor which divides into two light conductors and can thus bring together the symmetrical light on the measuring object. The image of the measuring object, illuminated by the coloured light, is then reflected onto a special black and white CCD sensor which is located at the end of the optic. This CCD sensor measures the data in the visible area from 400 to 700 nm.