Combined gold ring electrode with a pH glass membrane as reference electrode, installation length = 30.8 cm, narrowed to a diameter of 6.4 mm.
This maintenance-free electrode is well suited for redox titrations when the pH value remains constant, e.g.:
determination of the chemical oxygen demand (COD, ferrometry)
determination of penicillin and ampicillin
for titrations using Hg(NO3)2
for titrations in presence of chromium or iron
This electrode is stored in deion. water.