Bluelab Soil pH Pen – Direct Soil pH & Temperature Meter
Know what’s going on at the root zone. The Bluelab Soil pH Pen (SKU: PENSOILPH) measures pH and temperature directly in soil, coco coir, rockwool, potting mixes, and nutrient solutions — eliminating the need for messy soil slurries. Simply insert the dibber probe into your growing medium and get accurate, reliable readings in seconds.
With a double-junction pH probe, 0.1 pH resolution, full temperature compensation, and a waterproof design built for the grow room — not the lab — the Bluelab Soil pH Pen is the essential tool for any soil or media grower. Made in New Zealand. Trusted by growers worldwide.
Key Features
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Direct Soil Measurement – No Slurry Required — insert the KCl-filled storage cap/dibber directly into soil, coco coir, rockwool, or potting mix for instant readings
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Double-Junction pH Probe — superior contamination resistance for accurate, stable pH readings; longer probe life than single-junction designs
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0.1 pH Resolution with Full Temperature Compensation — reliable, accurate readings every time regardless of solution temperature
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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 cycle
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KCl-Filled Storage Cap/Dibber — dual-purpose cap keeps the pH probe hydrated and doubles as a dibber for direct root zone measurements
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Waterproof Design — easy switching between soil and nutrient solution; built to withstand daily grow room use
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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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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 — designed for the grower environment, not the lab; built to withstand knocks, drops, and deep-water plunges
Why Soil pH & Temperature Matter
Plants can only access nutrients when the pH of your growing medium falls within the correct range. If your soil or media is too acidic or too alkaline, plants can’t absorb the nutrients they need — regardless of how much you feed them. Temperature is equally critical: a medium that’s too hot or too cold directly affects plant growth rate and structure. The Bluelab Soil pH Pen gives you both measurements directly at the root zone, so you can act fast and keep your grow on track.
Compatible Growing Media
- Soil & potting mixes
- Coco coir
- Rockwool & stonewool
- Nutrient solutions & reservoirs
- Runoff & water source testing
Ideal For
- Soil & media-based growing operations
- Hydroponics & indoor growing
- Greenhouse & commercial cultivation
- Cannabis cultivation & precision pH control
- Coco coir, rockwool & potting mix growers
- Home growers & professional cultivators alike
Technical Specifications
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SKU: PENSOILPH
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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, fully temperature compensated
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Storage Cap: KCl-filled, doubles as dibber for direct soil measurement
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Housing: Waterproof
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Display: Backlit LCD
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Country of Origin: New Zealand
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Weight: 1 lb
Pro tip: Need to measure root zone moisture, conductivity (EC), and temperature as well? Check out the Bluelab Pulse Multimedia EC/MC Meter for complete root zone monitoring. Pair with Bluelab pH 4.0 and 7.0 calibration solution sachets and KCl storage solution for a full maintenance kit.
