Wartungsfreie Single-Parameter-Sonde zur Erfassung des Nitratgehaltes (NO3) Wasserqualitätsmessung in Grund- und Oberflächenwasser. In comparison to ion-selective nitrate electrodes, the calibration of the SPS-NO3 needs to be checked sporadically, saving time and money during ongoing measurement operations. An optionally available cleaning module with wiper additionally ensures that the measuring windows are free from unwanted fouling.