pH electrodes are delicate sensors that require proper care and maintenance to produce accurate and reliable results, and to prolong useful life. When the pH electrode is not used for a period of time, always keep it moist. Store the pH electrode in storage solution or in a pH 7 buffer. DO NOT store the electrode in distilled or deionised water as this will cause ions to leach out of the glass bulb and reference eledtrolyte, causing slow and sluggish response.
pH electrodes may be shipped with either protective caps or in electrode soaking bottles to prevent cracking or scratching, and to keep the glass bulbs moist. Remove the electrode gently from the storage bottle and rinsse it with distilled water before use. For long-term storage, always keep the pH electrode in the bottle, filled with sufficient storage solution to cover the glass bulb. Replenish the bottle as needed.