Bluelab pH Pen Plus Replacement Probe

The probe is the part of a pH pen that wears over time. As the sensing membrane ages or accumulates contamination, readings drift and accuracy degrades, and no amount of calibration will fully compensate for a probe that has reached the end of its working life. Replacing the probe restores the pH PenPlus to accurate performance without replacing the entire unit.

The Bluelab pH ProbePlus is a direct replacement probe for the Bluelab pH PenPlus, measuring both pH and temperature. The double-junction design improves resistance to contamination from nutrient solutions, extending the working life of the probe in regular use. Installs without tools, and the KCl-filled storage cap keeps the probe hydrated and ready between uses. Replacement probe only; Bluelab pH PenPlus sold separately.