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Precision pH Control for Better Beer

The Milwaukee pH55 PRO is a rugged, waterproof pH and temperature tester built for brewers who demand accuracy without overcomplicating the process. Whether you’re tracking mash pH for better conversion, adjusting your water profile, or checking fermentation health, the pH55 delivers reliable readings with ease. The dual-level LCD shows both pH and temperature in real time, while automatic temperature compensation ensures accuracy no matter your sample’s heat. With a pH accuracy of ±0.1, a wide range from -2.0 to 16.0, and 1- or 2-point automatic calibration, this tester is a serious upgrade from test strips and hobby-grade meters.

Designed for homebrewers, the pH55 PRO is ideal for dialing in your mash pH for optimal clarity and efficiency, verifying wort acidity during sour beer fermentation, or monitoring post-boil and pre-pitch conditions. The replaceable Mi56P probe is gel-filled and double-junction for low maintenance and high performance, and the IP65 waterproof body means it’s tough enough for a brew day spill. Lightweight, pocket-sized, and reliable, this meter is ready to help you brew better, cleaner beer—batch after batch.

What’s in the Box

Milwaukee pH55 PRO Tester
Pre-installed Mi56P pH/Temperature Electrode
4 × LR44/A76 Batteries
Protective storage cap
User manual

Note: MA9015 storage solution is required and not included for conditioning the electrode before first use.

Milwaukee pH55 PRO Care & Maintenance

Store the probe in MA9015 storage solution
Clean with MA9016 cleaning solution between brew days
Avoid storing in distilled or RO water
Calibrate before each brew session for optimal accuracy
Replace the Mi56P electrode when readings become unstable

Milwaukee pH55 PRO Recommended Accessories

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Milwaukee pH55 PRO Features

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Feature	Details
Model	Milwaukee Instruments pH55 PRO
pH Range	-2.0 to 16.0 pH
pH Resolution	0.1 pH
pH Accuracy	±0.1 pH
Temperature Range	-5.0 to 60.0°C / 23 to 140°F
Temp Accuracy	±0.5°C / ±1.0°F
Calibration	Auto, 1 or 2 points with 2 buffer sets
Temp Compensation	Automatic
Electrode	Replaceable Mi56P (double junction)
Battery Life	~300 hours
Auto-Off	After 8 minutes of inactivity
Waterproof	IP65-rated
Weight	3.5 oz (99 g)

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California Proposition 65

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⚠ Proposition 65 Warning: This product contains chemicals known to the State of California to cause cancer and/or birth defects or other reproductive harm.

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Milwaukee pH55 PRO pH/Temp Meter

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