Different measurement situations require different probes to suit the application at hand. This is precisely why Polytec offers a selection of scan heads that can be used in direct contact with and even at a greater working distance from the goods being measured. Probes that can be immersed in the product to be analyzed are also available. Some sensors have already been combined with an illumination module and have an internal reference. Using a multiplexer system with fiber-optic switches, a spectrometer can be equipped with several probes which are used at different measurement points.