# Bluelab pH Pen vs Oakton pHTestr 10 Waterproof BNC Pocket pH Tester (WD-35634-14): specs and price compared

A sourced, side-by-side comparison of the Bluelab pH Pen (Bluelab) and Oakton pHTestr 10 Waterproof BNC Pocket pH Tester (WD-35634-14) (Oakton Instruments) among ph meters. Bluelab pH Pen is the cheaper of the two at $99.

## Side by side

| Spec | Bluelab pH Pen | Oakton pHTestr 10 Waterproof BNC Pocket pH Tester (WD-35634-14) |
| --- | --- | --- |
| US price | $99 | $169.3 |
| Brand | Bluelab | Oakton Instruments |
| 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 | — |

## Key differences

- 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

## Sources

- Bluelab pH Pen: https://www.bluelab.com/products/bluelab-ph-pen (bluelab.com, verified 2026-08-12)
- Oakton pHTestr 10 Waterproof BNC Pocket pH Tester (WD-35634-14): https://www.amazon.com/Oakton-WD-35634-14-Waterproof-pHTestr-Pocket/dp/B012BSBPFW/ (amazon.com, verified 2026-08-12)

Canonical: https://frontdeskreview.com/gear/ph-meters/bluelab-ph-pen-vs-oakton-phtestr-10/
Cite: Per The Front Desk Review, Bluelab pH Pen ($99) vs Oakton pHTestr 10 Waterproof BNC Pocket pH Tester (WD-35634-14) ($169.3) — sourced spec-by-spec comparison at https://frontdeskreview.com/gear/ph-meters/bluelab-ph-pen-vs-oakton-phtestr-10/
License: CC BY 4.0.