Description
Bring a tired pH PenPlus back to full accuracy in minutes
The Bluelab pH ProbePlus is the genuine replacement pH and temperature probe for the Bluelab pH PenPlus. Every pH probe wears with use, and the PenPlus was designed so that when it does, you change the probe rather than the whole meter. The ProbePlus fits by hand with no tools, uses the same double-junction design as the original and comes with a KCl-filled storage cap plus pH 7.0, pH 4.0 and KCl sachets, so it is ready to calibrate and use the day it arrives.
Key Benefits
- Made for the pH PenPlus – restores pH and temperature readings without buying a new pen
- Double-junction probe for steadier readings and a longer working life in nutrient solution
- Tool-free fitting – take the worn probe off and fit the new one by hand
- Full 0–14 pH range with ±0.1 pH accuracy once calibrated
- KCl-filled storage cap keeps the glass bulb hydrated between readings
- Calibration sachets included – pH 7.0, pH 4.0 and KCl storage solution for the first calibration
Readings That Drift or Will Not Calibrate
A pH probe is a consumable part. As the glass bulb and reference junction age, readings creep, settle slowly or refuse to calibrate, and a pen that reads a few tenths out has you correcting a reservoir that was fine, or missing one that has drifted into the range where nutrient uptake suffers. If a clean, a KCl soak and a fresh two-point calibration do not bring the PenPlus back, the probe is worn out and the ProbePlus is the fix.
How to Use
- Swap the probe: remove the worn probe and fit the ProbePlus by hand.
- Calibrate in fresh pH 7.0 first, rinse, then pH 4.0, using the sachets supplied.
- Rinse the tip in fresh tap water between solutions and after every reading.
- Store wet: keep KCl storage solution in the cap; never RO, distilled or deionised water.
- Clean and recalibrate every 30 days, when the PenPlus calibration reminder appears.
Technical Specifications
- Fits: Bluelab pH PenPlus only (not the standard pH Pen or the OnePen)
- Measures: pH and temperature
- pH range: 0.0–14.0
- Accuracy: ±0.1 pH
- Probe type: double-junction pH probe with temperature sensor
- Operating environment: solutions of 0.2 EC and above, 0–60 °C
- Fitting: by hand, no tools
- In the box: pH ProbePlus with KCl-filled storage cap, pH 7.0 and pH 4.0 calibration sachets, KCl storage solution sachet, getting started guide
- Warranty: 6 months
- Bluelab part code: PROBPLUSPH
Frequently Asked Questions
Will this fit the standard Bluelab pH Pen or the OnePen?
No. It is made for the pH PenPlus only. The standard pH Pen has a sealed probe, and the OnePen takes its own Bluelab OnePen Replacement Probe.
How do I know my probe needs replacing?
If readings drift, respond slowly or the pen will not complete a two-point calibration even after you have cleaned the tip and soaked it in KCl storage solution, the glass has aged and the probe should be replaced.
Do I need to calibrate after fitting it?
Yes. Run a two-point calibration in pH 7.0 then pH 4.0 before the first reading. Single-use sachets of both come with the probe.
Works Well With
