Bluelab pH PenPlus pH and Temperature Meter
The Bluelab pH PenPlus measures pH and temperature in hydroponic nutrient solutions, irrigation water and runoff. Its replaceable double-junction probe lets you replace a worn probe rather than the whole meter. Made in New Zealand, this handheld pH meter combines IP68 dustproof and waterproof protection with a backlit display for daily grow-room and greenhouse checks.
Key Features
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Replaceable double-junction probe: Screw-cap design allows tool-free probe replacement with the Bluelab pH ProbePlus.
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Simultaneous pH and temperature readings: View both measurements on the backlit display, with selectable Celsius or Fahrenheit.
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IP68 protection: Dustproof and waterproof construction for demanding growing environments.
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Hold-reading function: Freeze the displayed measurement while recording results.
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2-point calibration: Calibrate with pH 7.0 and pH 4.0 solutions; a 30-day reminder helps you track maintenance.
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Probe storage cap: The KCl-filled silicone cap includes an internal sponge to help maintain probe hydration between uses.
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Portable design: Compact handheld construction, integrated lanyard and waterproof silicone probe cap support field, greenhouse and lab use.
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Auto-off: Helps conserve battery power.
What’s in the Box
- 1 Bluelab pH PenPlus with replaceable pH and temperature probe
- 1 pH 7.0 calibration solution, 18 ml
- 1 pH 4.0 calibration solution, 18 ml
- 1 KCl storage solution
Technical Specifications
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SKU: PENPLUSPH
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pH range: 0.0–14.0
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pH resolution: 0.1
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pH accuracy: ±0.1 at 25°C / 77°F
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Temperature range: 0–50°C / 32–122°F
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Temperature resolution: 1
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Temperature accuracy: ±1°C / ±2°F
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Operating environment: Solutions of 0.2 EC and above; 0–50°C / 32–122°F
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Protection rating: IP68, dustproof and waterproof
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Probe: Replaceable double-junction pH and temperature probe
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Calibration: 2-point pH calibration with 30-day reminder
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Power: 1 AAA alkaline battery
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Warranty: 2-year limited warranty; 6 months for the Bluelab pH ProbePlus
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Country of origin: New Zealand
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Listed weight: 12 oz
Using the pH PenPlus in Your Grow
Check nutrient solution and runoff pH to monitor changes in growing conditions and inform adjustments to your irrigation routine. Compare readings over time rather than relying on a single measurement. Keep additional pH 4.0 and pH 7.0 calibration solutions and KCl storage solution available for routine maintenance. A spare Bluelab pH ProbePlus can help reduce downtime when the original probe wears out.
Frequently Asked Questions
What does the Bluelab pH PenPlus measure?
It measures pH and temperature simultaneously. The listed operating environment is solutions of 0.2 EC and above, at 0–50°C / 32–122°F.
Can the pH PenPlus probe be replaced?
Yes. The replaceable double-junction probe uses a screw-cap design for tool-free replacement with the Bluelab pH ProbePlus.
Is the pH PenPlus waterproof?
The pH PenPlus has an IP68 dustproof and waterproof rating.
Which solutions are included for calibration and storage?
The package includes 18 ml each of pH 7.0 and pH 4.0 calibration solution, plus KCl storage solution. The meter supports 2-point calibration and has a 30-day calibration reminder.
Does the pH PenPlus display Fahrenheit?
Yes. You can select Celsius or Fahrenheit for temperature readings.
