Bluelab OnePen Replacement Probe — pH, EC & Temperature Keep your Bluelab OnePen performing like new with the Bluelab OnePen Replacement Probe—a genuine replacement sensor that restores accurate pH, conductivity (EC), and temperature readings without replacing the entire device. If your OnePen is showing signs of wear or calibration is becoming inconsistent, swapping the probe is the fastest way to get back to reliable monitoring with minimal downtime. Built for demanding grow environments, this probe features a durable double-junction pH design and titanium EC electrodes for long-lasting performance and dependable results. It’s also quick and simple to replace, making it a cost-effective, sustainable maintenance option for growers who rely on consistent measurements to protect plant health and nutrient balance. Key Benefits Extends the life of your Bluelab OnePen (reduces full device replacements) Fast, easy replacement to minimize downtime Accurate readings for pH, EC, and temperature with straightforward calibration Built tough: double-junction pH probe + titanium EC electrodes IP68 certified waterproof and dustproof for maximum protection Cost-effective & sustainable way to maintain accuracy Compatible With Bluelab OnePen™ Ideal For Hydroponics, coco, and soil growers who want precise nutrient and pH control Anyone noticing drifting readings, slower response, or general probe wear Tip: Regular calibration and proper probe care will help maximize accuracy and extend probe life.
