The Colorette 4 is used to accurately measure the color of ground roast coffee in the visible range of the electromagnetic wavelength spectrum. In this context, it functions based on the principle of reflection measurement. A white clock-pulsed LED illuminates a ground coffee sample prepared with a stripping device. The light reflected in the process is captured by a sensor and analyzed to determine the color of the coffee. The calculated color value is subsequently displayed on the Colorette’s touch screen. The device’s ability to output the result in different color scales means that it can be used flexibly and individually adapted to different needs.