# Bluelab pH Pen vs Milwaukee Instruments MW102 PRO+ 2-in-1 pH and Temperature Meter: specs and price compared

A sourced, side-by-side comparison of the Bluelab pH Pen (Bluelab) and Milwaukee Instruments MW102 PRO+ 2-in-1 pH and Temperature Meter (Milwaukee Instruments) among ph meters.

## Side by side

| Spec | Bluelab pH Pen | Milwaukee Instruments MW102 PRO+ 2-in-1 pH and Temperature Meter |
| --- | --- | --- |
| US price | $99 | not published |
| Brand | Bluelab | Milwaukee Instruments |
| 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 |

## Key differences

- 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

## Sources

- Bluelab pH Pen: https://www.bluelab.com/products/bluelab-ph-pen (bluelab.com, verified 2026-08-12)
- Milwaukee Instruments MW102 PRO+ 2-in-1 pH and Temperature Meter: https://milwaukeeinstruments.eu/milwaukee-mw102-pro-ph-meter-with-temperature-probe (milwaukeeinstruments.eu, verified 2026-08-12)

Canonical: https://frontdeskreview.com/gear/ph-meters/bluelab-ph-pen-vs-milwaukee-mw102/
Cite: Per The Front Desk Review, Bluelab pH Pen ($99) vs Milwaukee Instruments MW102 PRO+ 2-in-1 pH and Temperature Meter (not published) — sourced spec-by-spec comparison at https://frontdeskreview.com/gear/ph-meters/bluelab-ph-pen-vs-milwaukee-mw102/
License: CC BY 4.0.