Fresh-probe accuracy for your pH PenPlus
The Bluelab pH ProbePlus is the genuine replacement pH and temperature probe for the Bluelab pH PenPlus. pH probes wear out with use, and when yours starts drifting or refuses to calibrate, this probe screws onto your existing pen body by hand, no tools required. It uses the same double-junction design as the original probe for stable readings in nutrient solutions, and it ships with a KCl-filled storage cap that keeps the glass tip hydrated between uses. Recalibrate after the swap and your pen is back to fresh-probe performance for well under the price of a new meter.
- Pay full price for a new meter when only the probe is worn
- A working screen, body, and battery compartment go in the trash
- Set up and learn a new pen from scratch
- Costs you a whole meter every time the probe wears out
- Restores your pH PenPlus for well under the price of a new pen
- Keep the pen body, screen, and settings you already know
- Screws on by hand in minutes, no tools required
- Same double-junction design as the original PenPlus probe
- KCl-filled storage cap keeps the new probe hydrated
- Keep a spare on hand so a worn probe never means downtime
Double-junction pH probe ±0.1 pH
Two reference junctions instead of one. The outer junction takes the beating from nutrient salts so the inner junction stays clean, giving you the same stable, accurate readings the Bluelab pH PenPlus is known for.
Tool-free replacement
Unscrew the worn probe from the pen body, screw the ProbePlus on by hand, and recalibrate. The whole swap takes a few minutes and needs nothing but the new probe and your calibration solutions.
Measures pH and temperature
The ProbePlus replaces both sensors in one piece, so your pen keeps reading pH and solution temperature (°C or °F) on the same screen, just like the day you bought it.
KCl-filled storage cap
Arrives with a storage cap filled with KCl solution. Keeping the glass tip wet between uses is the single biggest factor in how long a pH probe lasts.
Made for the pH PenPlus only
Built specifically for the Bluelab pH PenPlus with its screw-off probe. It does not fit the original Bluelab pH Pen, which has a fixed, non-replaceable probe.
Zero-downtime spare
A probe typically gives 1 to 2 years of reliable use with proper care. Keeping a ProbePlus in the drawer means you can swap and keep measuring the moment readings start to drift.
How to swap in your new pH ProbePlus
Remove the worn probe
Unscrew the old probe from the base of your pH PenPlus by hand. No tools are needed, and the pen body, screen, and battery stay exactly as they are.
Screw on the ProbePlus
Screw the new probe onto the pen body by hand until it is fully seated and snug. Keep the storage cap on until you are ready to hydrate.
Rinse, store, repeat
After each use, rinse the probe tip in clean water, then replace the storage cap with a few drops of KCl solution inside. This keeps the probe hydrated and extends its working life.
- Bluelab pH ProbePlus replacement pH/temperature probe
- KCl-filled protective storage cap
- Replacement probe only: the pH PenPlus pen body is not included
- Bluelab Probe Care Kit (pH): Calibration sachets, KCl solution, and cleaning tools to get the most life out of your new probe
- Bluelab KCl Storage Solution: Keeps the probe tip hydrated between uses
- pH 7.0 and pH 4.0 Calibration Solution: For the 2-point calibration after the swap
- Bluelab pH PenPlus: Don't have the pen yet? This is the meter the ProbePlus is made for
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