Bluelab pH Pen – Waterproof Handheld pH & Temperature Meter
The go-to pH pen for growers worldwide. The Bluelab pH Pen (SKU: PENPH) is a compact, hardy, and easy-to-use handheld meter that delivers accurate pH and temperature readings in any nutrient solution. With a double-junction pH probe, 0.1 pH resolution, simple 2-point calibration, and a fully waterproof design that floats — it’s the essential measurement tool for every growing setup, from home hydroponics to commercial greenhouse operations.
Built in New Zealand. Trusted by growers worldwide. One of Bluelab’s top-selling instruments for good reason.
Key Features
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Double-Junction pH Probe — superior contamination resistance for accurate, stable pH readings in nutrient-rich solutions; longer probe life than single-junction designs
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0.1 pH Resolution — precise readings for confident nutrient management and crop health decisions
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2-Point pH Calibration with 30-Day Reminder — simple calibration keeps readings accurate; built-in reminder ensures you never miss a calibration cycle
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Simultaneous pH & Temperature — reads both parameters at once on a bright backlit display
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Temperature in °C or °F — switch between Celsius and Fahrenheit to suit your region
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Waterproof & Floats — fully waterproof construction that floats in solution; safe for daily use in reservoirs, runoff trays, and water sources
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Compact Handheld Design — ergonomic, pocket-sized form factor for convenient use anywhere in the grow room or field
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Made in New Zealand — decades of Bluelab precision instrument manufacturing behind every pH Pen
Why pH & Temperature Matter
Plants can only access nutrients when the nutrient solution is within the correct pH range. If your solution becomes too acidic or too alkaline, plants can’t absorb the nutrients they need to grow. Temperature is equally critical — a solution that’s too hot or too cold directly affects growth rate and plant structure. The Bluelab pH Pen gives you both measurements simultaneously so you can keep your grow in the optimal range, every time.
Ideal For
- Hydroponics & indoor growing nutrient management
- Aquaponics & aquaculture water quality monitoring
- Greenhouse & commercial growing operations
- Cannabis cultivation & precision pH control
- Coco coir, NFT, DWC & recirculating systems
- Runoff & water source pH testing
- Home growers & professional cultivators alike
Technical Specifications
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SKU: PENPH
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pH Resolution: 0.1 pH
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Calibration: 2-point pH calibration with 30-day reminder
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Probe: Double-junction pH probe
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Temperature: °C or °F
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Housing: Waterproof, floats in solution
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Display: Backlit LCD
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Country of Origin: New Zealand
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Weight: 12 oz
Pro tip: Pair the Bluelab pH Pen with the Bluelab Conductivity Pen for a complete nutrient solution measurement system — covering both pH and EC/PPM in one workflow. Add Bluelab pH 4.0 and 7.0 calibration solution sachets and KCl storage solution for a full maintenance kit.
