FAQ and troubleshooting for the Bluelab pH
Pen
Find answers and solutions to common questions for the Soil
pH Pen, pH Pen, and Bluelab pH probes
In this guide:
• General questions
• Understanding error messages
• Troubleshooting
General questions
My pH product won’t calibrate, what should I do?
The first step is to make sure the glass tip of the probe is both well hydrated and clean.
• Learn how to hydrate your pH pen in our guide
• Learn how to calibrate your pen in our guide
If, after both hydrating and cleaning, your pH pen still won’t calibrate, it may be at the end of its
life. Please reach out to our support team if you have further questions.
My pH reading is stuck on 7 pH, what should I do?
Inspect the glassware for damage. If the pen reading is stuck on 7 pH (or close to that), it is likely
the glassware is damaged. The pH pen likely needs replacing.
My pH probe has accidentally dried out, what should I do?
The probe must be rehydrated for 24 hours in KCI storage solution (never use RO, distilled
or deionised water). Next, carry out a calibration to check the probe hasn’t suffered permanent
damage.
There is a salt crust on my probe – why?
Both the pH pen/probe and the storage cap contain KCl (Potassium Chloride) solution. The result
of a small level of evaporation of KCl is the formation of a salt crust as KCl is a type of salt.
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