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The pH probe should always be handled in accordance to the instructions of the manufacturer. The pH electrode is delicate and should be handled with care, avoiding forceful contact with hard objects [2, 7]. As noted earlier, the planar electrode utilizes both an active and a reference electrode. The level of the electrode solution (3 mol/L potassium chloride [KCl]) in the external reference electrode sheath should be verified regularly and supplemented if too low (the required minimum fill level may differ between manufacturers). During short breaks between measurements, the electrode measuring surface should be immersed in a KCl solution or in deionised water. For longer storage intervals, the protective electrode covering cap should be filled and regularly refilled with a KCl solution. After prolonged storage, the electrode should be immersed in a KCl solution for at least 12 h prior to use [2]. Any white KCl that may deposit around the membrane or externally on the electrode should be removed with distilled water [24].