There are steps you can take to try and recondition the pH probe. There is no guarantee it would work or for how long it would hold calibration afterwards. For peace of mind I would buy a new probe, a
new pinpoint pH probe is $45 US at BRS.
Here are the steps that Focustronic provides:
Guidelines how to restore a dry damaged pH electrode Introduction pH electrodes must stay wet. If they of some reason are left dry too long, they will not work correct. But in many cases there is a good chance to restore a damaged electrode with this procedure. This procedure can also be performed if you suspect any issue with the electrode of other reasons, like impossible to calibrate correct or despite good calibration, odd readings afterwards.
Method
1. Soak the electrode for 20 minutes in ”electrode cleaning solution”, typically 0.1Molar HCl (Hydrogen Chloride).
2. Rinse the electrode in tap water and let it soak in ”probe storage solution” for approx 12 hours. The solution is typically a 3.5 Molar KCl (PotassiumChloride) solution.
3. Rinse again and soak the electrode in a ”ph cal 4 solution” for 2 hours (don´t use this cal solution for subsequent calibration!).
4. Rinse carefully in RO water and recalibrate the electrode as usual (7 and 4 solution)
