Milwaukee Mi56P Replacement pH Probe for pH55 & pH56 Restore Fast, Stable Readings to Your Waterproof Pocket Meter Bring your Milwaukee pH55 or pH56 back to peak performance with the Mi56P replacement pH electrode. This waterproof, serviceable probe installs in minutes and helps deliver quick, repeatable measurements for brewing, meadmaking, aquariums, hydroponics, and more. Why Choose the Mi56P Direct fit: Designed specifically for Milwaukee pH55 and pH56 testers. Stable readings: Double-junction design helps resist clogging and sample contamination. Waterproof & rugged: Built for field use with tight sealing and durable construction. Cost-effective: Replace the probe—not the whole meter—to extend product life. When to Replace Readings won’t stabilize even after fresh calibration and proper storage. Response is slow compared with new or known-good buffers. Physical damage, salt crusting inside the tip, or a visibly dried bulb that won’t recover after soaking. Installation & Setup Power off the meter and remove the old probe per the tester’s instructions. Seat the Mi56P firmly; ensure O-rings/seals are clean and properly aligned. Rinse the new probe with clean water, soak in storage solution for at least 15–30 minutes, then perform a fresh 1–2 point calibration. Care & Maintenance Rinse after each reading to reduce carryover and junction fouling. Store the probe wet: use Milwaukee pH Meter Storage Solution (keeps the pH bulb hydrated and ready to read). Calibrate regularly (pH 7.01 plus 4.01 or 10.01) and whenever accuracy matters. Tip: Keep fresh buffer solutions on hand—old or contaminated buffers can mimic a failing probe.
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