The replacement probe for the Bluelab pH PenPlus. The sensor is the consumable part of the pen, so when it will no longer hold a calibration you change the probe rather than buying another meter.
Screws straight on, no tools needed. Calibrate once fitted and the pen is as good as new.
Fits the Bluelab pH PenPlus only. Keep the new probe accurate for longer with Bluelab KCl Storage Solution (100ml) and the Bluelab pH Probe Care Kit.
Specification
| Type | Replacement pH probe |
| Fits | Bluelab pH PenPlus only |
| Fitting | Screw on, no tools |
Frequently asked questions
Will this fit the standard pH Pen or the One Pen?
No. This is the PenPlus probe only. The One Pen takes its own replacement probe, and the standard pH Pen is a sealed unit.
Do I need to calibrate after fitting it?
Yes. Fit the new probe, then run a two-point calibration with fresh pH 4.0 and pH 7.0 solutions before you use it.
How do I get the most out of it?
Keep the tip wet in Bluelab KCl storage solution, rinse after each use, and never leave it dry in a drawer.