Bluelab Soil pH Pen - Direct Measurement in Soil, Coco Coir, and Potting Mixes

Direct Soil and Substrate pH Readings, No Slurry Required

Preparing a slurry for every soil pH check adds a delay that most daily rounds cannot absorb. The Bluelab Soil pH Pen measures pH directly in soil, coco coir, potting mixes, and solution with no extraction step, so a reading is available as soon as the probe is inserted.

An integrated storage cap protects the probe between uses and doubles as a dibber for creating insertion holes in dense substrates, and the pen is fully waterproof with a measurement range of 0.0 to 14.0 pH across 0 to 50 degrees C (32 to 122 degrees F).

Key Features & Benefits

• Direct substrate measurement — no slurry prep needed for soil, coco coir, and potting mix readings.
• Fully waterproof — withstands wet greenhouse environments and rinses clean after use.
• Two-point calibration with 30-day indicator — uses pH 7.0 and pH 4.0 (or pH 10.0) solutions on a visible schedule.
• Integrated storage cap and dibber — protects the probe and creates insertion holes in dense media.
• 1-year warranty, made in New Zealand — 0.0-14.0 pH range with 0.1 pH resolution.

Who Should Use This

Greenhouse growers, nursery operators, and soil-based crop producers who need immediate root-zone pH data without the delay of slurry testing are the direct fit for this pen.

About Bluelab Corporation

Bluelab designs and builds its measurement pens in New Zealand, with the Soil pH Pen purpose-built for direct-media pH testing rather than solution-only use.

Frequently Asked Questions

Can this pen measure pH in solution as well as soil?

Yes, in addition to direct soil, coco coir, and potting mix measurement, it also measures pH in liquid solutions. This makes it useful across mixed media programs.

What is the measurement accuracy?

Accuracy is within plus or minus 0.1 pH and plus or minus 1 degree C, with a resolution of 0.1 pH and 1 degree. This suits routine root-zone monitoring.

What is the storage cap used for?

The integrated cap protects the probe during storage and has a pointed dibber end for creating insertion holes in compact or dense growing media. This avoids stressing the probe tip during insertion.

How do I calibrate this pen?

Two-point calibration uses pH 7.0 and pH 4.0 solutions, or pH 10.0 as an alternative high-range point. Bluelab calibration solutions are sold separately.