In conjunction with CASSY (5210.524013, 5210.524006, 5210.524005W, 5210.524018) or the universal chemistry measuring instrument (5210.531836) and appropriate reagents (666 ;2600, 666 2601), pollutants and turbidity can be measured on water samples. In the software, the determination of 17 pollutants is already programmed. Moreover, you can do an arbitrary number of determinations of your own and store them. Apart from direct transmission, extinction and concentration measurements, the evolution of these quantities in the course of time can also be followed (kinetic measurement). The device can also be employed for long-term measurements (e.g. measurement of the turbidity in a bioreactor).