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Bluelab
Bluelab pH Pen
$99
Best Ph Meters · head-to-head
Bluelab pH Pen vs Milwaukee Instruments MW102 PRO+ 2-in-1 pH and Temperature Meter
A sourced, side-by-side comparison. Bluelab pH Pen is cheaper at $99. Every spec and price links to its source.
Milwaukee Instruments
Milwaukee Instruments MW102 PRO+ 2-in-1 pH and Temperature Meter
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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 | Milwaukee Instruments MW102 PRO+ 2-in-1 pH and Temperature Meter |
|---|---|---|
| US price | $99 | — |
| Brand | Bluelab | Milwaukee Instruments |
| Released | — | — |
| Ph range | 0.0 to 14.0 | -2.00 to 16.00 pH |
| Resolution ph | 0.1 | 0.01 pH |
| Accuracy ph | ±0.1 at 25°C/77°F | ±0.02 pH |
| Calibration points | Two-point (pH 7.0 and pH 4.0 solutions), with a built-in 30-day calibration reminder | Automatic, 1 or 2 points |
| Atc | Yes, fully temperature compensated | Automatic, 0 to 70°C |
| Electrode type | Double-junction pH probe | SE220 gel-filled double-junction lab-grade pH electrode + MA831R temperature probe (both included) |
| Waterproof rating | Waterproof; floats in any solution | — |
| Battery type | 1 x AAA alkaline | 1 x 9V, approx. 300 hours continuous use |
Sources — Bluelab pH Pen: bluelab.com (verified 2026-08-12). Milwaukee Instruments MW102 PRO+ 2-in-1 pH and Temperature Meter: milwaukeeinstruments.eu (verified 2026-08-12).
What's the difference between the Bluelab pH Pen and Milwaukee Instruments MW102 PRO+ 2-in-1 pH and Temperature Meter?
Where the two actually differ on the specs we track (7 of 8). Matching specs are omitted.
- Ph range: Bluelab pH Pen 0.0 to 14.0 vs Milwaukee Instruments MW102 PRO+ 2-in-1 pH and Temperature Meter -2.00 to 16.00 pH
- Resolution ph: Bluelab pH Pen 0.1 vs Milwaukee Instruments MW102 PRO+ 2-in-1 pH and Temperature Meter 0.01 pH
- Accuracy ph: Bluelab pH Pen ±0.1 at 25°C/77°F vs Milwaukee Instruments MW102 PRO+ 2-in-1 pH and Temperature Meter ±0.02 pH
- Calibration points: Bluelab pH Pen Two-point (pH 7.0 and pH 4.0 solutions), with a built-in 30-day calibration reminder vs Milwaukee Instruments MW102 PRO+ 2-in-1 pH and Temperature Meter Automatic, 1 or 2 points
- Atc: Bluelab pH Pen Yes, fully temperature compensated vs Milwaukee Instruments MW102 PRO+ 2-in-1 pH and Temperature Meter Automatic, 0 to 70°C
- Electrode type: Bluelab pH Pen Double-junction pH probe vs Milwaukee Instruments MW102 PRO+ 2-in-1 pH and Temperature Meter SE220 gel-filled double-junction lab-grade pH electrode + MA831R temperature probe (both included)
- Battery type: Bluelab pH Pen 1 x AAA alkaline vs Milwaukee Instruments MW102 PRO+ 2-in-1 pH and Temperature Meter 1 x 9V, approx. 300 hours continuous use