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It is extremely important to care for and store pH electrodes when not in use.
Too often, electrodes lose the ability to retain calibration because they were stored in distilled water or allowed to dry out.

When pH electrodes are not being used, left overnight or for longer periods, the pH electrode should be kept to soak in Electrode Storage Solution.

Ideally the pH glass sensing bulb should always be kept in the solution to maintain maximum response from the electrode and increase the life of your digital pH meter.