Bluelab pH Pen Meter - Measures pH and Temperature

Affordable Waterproof pH Pen for Daily Reservoir Checks

Not every pH check needs a full-featured meter, and the Bluelab pH Pen covers the daily basics in a compact, fully waterproof format: reservoir pH, feeding solution spot-checks, and irrigation water monitoring. Automatic temperature compensation and two-point calibration with a 30-day on-screen indicator keep readings dependable without extra complexity.

A hold-reading function locks the display for easy recording, and auto-off conserves battery life when the pen sits idle.

Key Features & Benefits

• Measures pH and temperature — two key solution parameters in one pocket-sized pen.
• Automatic temperature compensation — adjusts pH readings based on solution temperature.
• Fully waterproof — safe to submerge and easy to rinse clean.
• Two-point calibration with 30-day indicator — keeps recalibration on a visible schedule.
• Hold reading and auto-off — locks a reading for recording and saves battery life automatically.

Who Should Use This

Growers and hobbyists who need a reliable, straightforward handheld pH meter for daily solution and reservoir monitoring, where portability and simplicity are priorities, are the direct fit.

About Bluelab Corporation

Bluelab, a New Zealand company with more than three decades in pH measurement, offers this pen as its entry-level pocket pH option alongside its more feature-rich meters.

Frequently Asked Questions

Can the pH probe in this pen be replaced?

No, the double-junction pH probe in this pen is integrated and not replaceable. When it reaches the end of its service life, the full pen is replaced rather than just the probe.

How often should this pen be calibrated?

A 30-day calibration indicator on the display reminds you when two-point recalibration is due, using Bluelab pH 4.0 and 7.0 calibration solutions. Staying on this schedule keeps readings dependable between checks.

Is this pen fully waterproof?

Yes, it is fully waterproof, safe to submerge in reservoirs and easy to rinse clean after use. This makes it suitable for wet greenhouse and grow room conditions.

What battery does this pen use?

One replaceable AAA battery ships with the pen and powers it for extended everyday use. Swap in a fresh one whenever the display starts to dim or respond slowly.