Milwaukee ORP Probe - Hydros

The Milwaukee Double Junction ORP Platinum Electrode is designed for continuous ORP monitoring in aquarium environments. Unlike single junction probes, the double junction configuration significantly reduces the risk of clogging at the reference junction, which is one of the most common causes of ORP drift and unstable readings. The result is more consistent measurements and longer intervals between maintenance tasks.

The probe uses a gel-filled electrolyte system, which means there is no liquid to top off or replace. This design choice directly reduces the ongoing maintenance burden — once the probe is calibrated and installed, you can focus on your tank rather than the probe itself. The platinum sensing electrode is well suited for long-term deployment, retaining accuracy without frequent replacement.

The outer body is constructed from resin that is both chemically resistant and impact-tolerant. In a working reef environment where accidental bumps and chemical splashes are inevitable, this provides meaningful protection for the sensing bulb. The probe is paired and sold specifically for use with Hydros controllers, making it a straightforward upgrade or replacement for hobbyists already running a Hydros system who want dependable ORP data as part of their water quality monitoring routine.