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Published product information, with original specification labels and units. A missing specification is unknown, not proof that a feature is absent.
Buying decisionBluelab

Bluelab pH Pen, PENPH

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Useful forA grower prioritizing a backlit pH display and a visible calibration reminder for solution testing.
Check firstOriginal PENPH has a nonreplaceable probe; do not confuse it with pH PenPlus.
Published specifications
Model
PENPH, original Bluelab pH Pen
pH range
0.0–14.0
pH resolution
0.1 pH
pH accuracy
±0.1 pH at 25°C
Temperature
0–50°C / 32–122°F; 1° resolution; ±1°C / ±2°F accuracy
Calibration
Current product page: 2-point with 30-day reminder; manual permits optional third point
Operating solution
0.2 EC and above, per manufacturer
Probe
Double-junction, nonreplaceable
Power
1 AAA alkaline battery
Storage
KCl storage solution in cap; manufacturer manual specifies 24-hour hydration before first use and after cleaning
Display
Backlit; hold function
Other tradeoffs
  • Measures pH and temperature, not EC or nutrient balance.
  • Manufacturer specifies solutions of 0.2 EC and above; pure-water pH testing is outside that stated environment.
  • Probe must stay hydrated with Bluelab KCl storage solution and needs continuing cleaning and calibration.
Sources & model detailsPublished product source ↗

Researched 2026-09-14.

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These profiles summarize published information, not hands-on testing. Different products may serve different roles. Check matching measurements, the exact model and pack, and current seller terms. This comparison does not certify system compatibility or show live prices or stock.

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