If you've ever had to throw away a perfectly good pH pen just because the probe wore out, the Bluelab pH PenPlus was designed with you in mind. It's the first step toward a smarter, more sustainable approach to pH measurement — one where you replace the probe, not the pen.

What Makes the pH PenPlus Different?

Most pH pens are a single-use investment. When the probe degrades — and it will, through normal use — the whole unit goes in the bin. The Bluelab pH PenPlus breaks that cycle with a replaceable double-junction pH and temperature probe. A simple screw-cap design means swapping the probe takes seconds, not tools.

The result: less downtime, less waste, and more confidence in every reading.

Built for Demanding Environments

Whether you're testing nutrient solution in a hydroponic grow room, monitoring runoff in an irrigated field, or checking water quality in a lab, the pH PenPlus is rated IP68 dustproof and waterproof. It's built to go where the work is.

• Bright backlit display for easy reading in any light
• Simple 2-point calibration with a 30-day reminder
• Auto-off function to conserve battery
• Integrated lanyard and waterproof silicone probe cap
• KCl-filled cap with internal sponge keeps the probe hydrated between uses

Why pH Matters in Hydroponics

Healthy plant growth starts with the right pH. In hydroponic and irrigated systems, nutrients are only available to plants when the root zone stays within the correct pH range. Drift too acidic or too alkaline, and even a perfectly balanced nutrient solution becomes unavailable to the plant.

Measuring runoff pH gives you a window into what's happening at the roots — before problems become visible above ground. Regular, accurate pH checks let you make small adjustments early, keeping your crop in the optimal range for efficient nutrient uptake and healthy growth.

Technical Highlights

• pH range: 0.0–14.0 | Resolution: 0.1 | Accuracy: ±0.1 at 25°C
• Temperature: 0–50°C / 32–122°F | Accuracy: ±1°C / ±2°F
• Power: 1× AAA alkaline battery
• Warranty: 2-year limited (6 months for the replacement probe)
• Box includes: pH PenPlus, pH 7.0 and pH 4.0 calibration sachets, KCl storage solution

The Smart Long-Term Choice

The Bluelab pH PenPlus isn't just a pH meter — it's a commitment to continuity. By keeping a replacement probe on hand, you're never caught off guard by probe wear. Your workflow stays uninterrupted, your readings stay accurate, and your investment goes further.

Ready to upgrade your pH testing? Shop the Bluelab pH PenPlus today.