Worn-out pH probes force growers to replace an entire meter just to keep readings accurate — an unnecessary cost when only the probe has failed. While the standard
Bluelab pH Pen is a reliable favorite, the PenPlus solves this issue of probe wear with a screw-cap replaceable pH and Temperature probe, letting you swap in a new probe in seconds instead of buying a new pen.
Built around a double-junction pH probe for consistent accuracy, the pH PenPlus reads pH from 0.0–14.0 with ±0.1 accuracy and tracks temperature from 32–122°F (0–50°C). A silicone cap filled with
Bluelab KCl storage solution uses an internal sponge to keep the probe hydrated between uses, while an IP68 dustproof and waterproof rating and bright backlit display make it dependable in demanding grow room and reservoir conditions.
Day-to-day operation stays simple: a 2-point calibration process with a 30-day reminder keeps the pH PenPlus accurate without guesswork, and an auto-off function conserves battery life between uses. The compact handheld design includes an integrated lanyard with a waterproof silicone probe cap, making it easy to carry between reservoirs. For growers who also need to check nutrient levels, this pen is the perfect companion to the
Bluelab Truncheon Meter. Each PenPlus ships with calibration solution sachets and storage solution, giving growers everything needed to start taking accurate readings right out of the box.
Features
🔬
Double-Junction pH Probe
Delivers consistent, reliable pH readings across a full 0.0–14.0 range.
🔄
Replaceable Probe Design
Screw-cap pH/Temperature probe swaps out in seconds, extending the pen's usable life.
💧
Hydrated Probe Cap
KCl-filled silicone cap with internal sponge keeps the probe hydrated between uses.
🛡️
IP68 Waterproof & Dustproof
Sealed rating protects internal electronics from moisture and grow room dust.
⚙️
Quick 2-Point Calibration
Simple calibration with a 30-day reminder keeps readings accurate over time.
💡
Backlit Display
Bright screen stays easy to read in low-light grow environments.
What's Included
Bluelab pH PenPlus with replaceable pH and Temperature probe
The Bluelab pH PenPlus is covered by a 2-year limited warranty.
Frequently Asked Questions
How do I replace the probe on the Bluelab pH PenPlus?+
The probe uses a screw-cap design — unscrew the used pH probe and thread in a new one. No tools are needed, though you'll want to recalibrate after installing a fresh probe.
How often should I calibrate the pH PenPlus?+
Bluelab recommends regular 2-point calibration, and the pen includes a built-in 30-day reminder so you don't miss a cycle.
What temperature range can the pH PenPlus be used in?+
It operates and reads accurately between 32–122°F (0–50°C). Avoid using or storing the pen outside this range, as it can affect probe performance.
Is the Bluelab pH PenPlus waterproof?+
Yes. It carries an IP68 dustproof and waterproof rating, making it suitable for wet grow room and reservoir environments.
What's included in the box?+
Each PenPlus ships with the pen and replaceable probe, plus single-use 7.0 and 4.0 pH calibration solution sachets and a KCl storage solution sachet to get you started.
What warranty comes with the pH PenPlus?+
The Bluelab pH PenPlus is covered by a 2-year limited warranty.
Happy To Help
Questions About This Product?
Our specialists are happy to help. Call us or send a message and we'll get back to you within one business day (most of the time within a few hours.)
