bluelab pH Pen - pH pen probe care; Storing the pH pen tip; Long term storage guidelines; Procedure for dried-out probes

pH calibration failed
Calibration solutions may be
contaminated
Always use fresh calibration
solutions
Probe not hydrated or clean
Follow the cleaning and
calibration steps
Probe damaged.
Replace the pH pen
Hardware error
The pH probe may be
damaged
Check for broken glass on the
tip of the pen’s pH probe.
Consider replacing your pH
pen.
Troubleshooting
Trouble
Reason
Correction