There are two issues here: 1) Solutions that are difficult to measure 2) Solutions that will damage the sensor Solutions that are Difficult to Measure......
pH electrodes will NOT give accurate pH values in distilled or deionized water because distilled and deionized water do not have enough ions present for......
Generally, rinsing the electrode with distilled water after using should suffice. If the glass bulb looks dirty, you can rinse the electrode with warm water......