Milwaukee pH55 Waterproof pH/Temperature Tester with ATC – Replaceable Probe (0.1 pH Resolution)

Milwaukee pH55 Waterproof pH/Temperature Tester with ATC

Durable, Accurate Pocket Meter with Replaceable Electrode

The Milwaukee pH55 is a waterproof pocket pH meter that delivers fast, reliable readings for brewing, meadmaking, aquariums, and hydroponics. It features automatic temperature compensation (ATC), auto 1–2 point calibration (pH 7.01 + 4.01 or 10.01), and a replaceable double-junction probe (Mi56P) for long service life. Read pH and temperature on a large dual-level LCD with 0.1 pH resolution and typical accuracy to ±0.1 pH.

Why Brewers & Makers Choose pH55

• Consistent accuracy: 0.1 pH resolution, ±0.1 pH typical accuracy across a wide −2.0 to 16.0 pH range.
• ATC built in: Automatically compensates readings from −5 to 60 °C.
• Simple calibration: Automatic 1–2 point with memorized buffers (7.01/4.01/10.01 or 6.86/4.01/9.18).
• Field-ready: Waterproof handheld design with stability indicator, hold function, and long battery life.
• Serviceable: Replaceable Mi56P electrode extends meter lifespan and reduces total cost of ownership.

Specs at a Glance

• pH Range: −2.0 to 16.0 pH
• Resolution / Accuracy: 0.1 pH / ±0.1 pH (typ.)
• Temperature: −5 to 60 °C (ATC)
• Calibration: Automatic, 1 or 2 points (7.01 with 4.01 or 10.01; alt set 6.86/4.01/9.18)
• Electrode: Replaceable double-junction Mi56P
• Waterproof: Sealed handheld design for field use
• Battery Life: ~300 hours (auto-off to save power)

Care & Use

• Rinse after each reading to prevent carryover and keep the junction clean.
• Store the probe wet: use Milwaukee pH Meter Storage Solution (keeps the pH bulb hydrated and ready to read).
• Recalibrate regularly, especially after long storage, temperature swings, or heavy cleaning.

Good to know: The pH55 is an excellent step up from basic pens thanks to ATC, 2-point auto calibration, and a replaceable probe—ideal for consistent mash/must checks and quick water adjustments.