Aqua Medic pH- and mV-electrodes (Redox-potential) are quality products designed for both accurate measurement and long, trouble free use. Both types of electrodes are available in three versions: Standard electrodes - with plastic shaft, glass electrodes – laboratory standard for extended performance. Electrodes with plastic shaft and PG 13.5 thread - pressure resis-tant up to 3 bar, and can be used in plumbing fi ttings or in the closed versions of the Nitratereductors NR 400 and Calciumreactors KR 400. These electrodes are available in a short version for the CalciumreactorKR 1000 and the Nitratereductor NR 1000.