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Bluelab
Bluelab pH Pen
$99Cheaper
Best Ph Meters · head-to-head
Bluelab pH Pen vs Oakton pHTestr 10 Waterproof BNC Pocket pH Tester (WD-35634-14)
A sourced, side-by-side comparison. Bluelab pH Pen is cheaper at $99. Every spec and price links to its source.
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Oakton Instruments
Oakton pHTestr 10 Waterproof BNC Pocket pH Tester (WD-35634-14)
$169.3
Which is better: the Bluelab pH Pen or Oakton pHTestr 10 Waterproof BNC Pocket pH Tester (WD-35634-14)?
On the specs we track, they're closely matched. The Bluelab pH Pen is the cheaper at $99.
See Bluelab pH Pen on Amazon Check Oakton pHTestr 10 Waterproof BNC Pocket pH Tester (WD-35634-14) price
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Full spec sheet
✓ marks the stronger figure where "more" — or "less", for price and weight — is unambiguously better.
| Spec | Bluelab pH Pen | Oakton pHTestr 10 Waterproof BNC Pocket pH Tester (WD-35634-14) |
|---|---|---|
| US price | $99 | $169.3 |
| Brand | Bluelab | Oakton Instruments |
| Released | — | — |
| Ph range | 0.0 to 14.0 | — |
| Resolution ph | 0.1 | — |
| Accuracy ph | ±0.1 at 25°C/77°F | — |
| Calibration points | Two-point (pH 7.0 and pH 4.0 solutions), with a built-in 30-day calibration reminder | Three-point, push-button calibration with auto-buffer recognition |
| Atc | Yes, fully temperature compensated | — |
| Electrode type | Double-junction pH probe | Replaceable BNC pH probe |
| Waterproof rating | Waterproof; floats in any solution | IP67 |
| Battery type | 1 x AAA alkaline | — |
Sources — Bluelab pH Pen: bluelab.com (verified 2026-08-12). Oakton pHTestr 10 Waterproof BNC Pocket pH Tester (WD-35634-14): amazon.com (verified 2026-08-12).
What's the difference between the Bluelab pH Pen and Oakton pHTestr 10 Waterproof BNC Pocket pH Tester (WD-35634-14)?
Where the two actually differ on the specs we track (3 of 8). Matching specs are omitted.
- Calibration points: Bluelab pH Pen Two-point (pH 7.0 and pH 4.0 solutions), with a built-in 30-day calibration reminder vs Oakton pHTestr 10 Waterproof BNC Pocket pH Tester (WD-35634-14) Three-point, push-button calibration with auto-buffer recognition
- Electrode type: Bluelab pH Pen Double-junction pH probe vs Oakton pHTestr 10 Waterproof BNC Pocket pH Tester (WD-35634-14) Replaceable BNC pH probe
- Waterproof rating: Bluelab pH Pen Waterproof; floats in any solution vs Oakton pHTestr 10 Waterproof BNC Pocket pH Tester (WD-35634-14) IP67