The SEKO Photometer System is a professional instrument for measuring chlorine, based on sampling with the photometric method (DPD).Real-time measurement of parameters ensures the highest accuracy in professional water-treatment applications.The Photometer System allows users to monitor up to six parameters: three parameters with the photometric sampling method and three parameters using external probes.Models availableSingle parameterFree chlorineTotal chlorineMulti parameter:Free chlorine and pHFree chlorine, pH and ORPpH, ORP and free, total & combined chlorine