Bluelab ONE Pen Replacement Probe | pH + EC + Temperature Sensor

Keep your readings sharp and your Bluelab ONE Pen performing like new with the Bluelab ONE Pen Replacement Probe. Designed as a direct replacement for the original probe, this unit restores accurate pH, conductivity (EC), and temperature measurement—helping you stay on top of nutrient uptake and maintain a stable feed program.

Instead of replacing the entire device, swapping the probe is a smarter, more sustainable way to extend the life of your ONE Pen. It’s quick to install, reducing downtime, and built for real grow environments with a double-junction pH probe, titanium EC electrodes, and IP68 waterproof/dustproof protection.

Why Replace the Probe?

Over time, probes naturally wear from regular use, cleaning, and exposure to nutrient solutions. Replacing your probe helps:

• Restore accuracy and response speed

• Reduce calibration drift

• Extend the working life of your Bluelab ONE Pen

• Keep your testing routine reliable and consistent

Key Features

• Replacement probe for Bluelab ONE Pen

• Measures pH + EC + Temperature (supports easy calibration)

• Double-junction pH probe for improved durability in nutrient solutions

• Titanium EC electrodes for robust conductivity measurement

• IP68 certified dustproof and waterproof

• Quick, simple replacement to minimise downtime

• Cost-effective, sustainable maintenance vs full device replacement