The Milwaukee MA921B/2 Lab Grade Double Junction ORP Platinum Probe with Extended Cable is a high-quality, specialized electrode designed for continuous monitoring of Oxidation-Reduction Potential (ORP) in saltwater aquariums. This probe is specifically engineered to integrate seamlessly with Milwaukee Monitors and Controllers, providing essential data for maintaining optimal water chemistry in delicate reef environments.

Key features include a double junction design, which significantly reduces the risk of clogging and ensures more stable, accurate ORP measurements with minimal maintenance. Its gel-filled electrolyte eliminates the need for constant refilling, while the durable platinum electrode offers long-lasting performance. Encased in a robust PEI resin body, the probe is chemically resistant and protected against accidental damage. With a generous 6.6-foot cable length, a BNC connection, and a ±2000 mV ORP range, it provides flexibility for various setups. For best results, store the probe in buffer or storage solution, clean it regularly, and calibrate after cleaning or storage.

This probe is an ideal choice for serious aquarists utilizing Milwaukee monitoring systems who require precise and reliable tracking of their aquarium's redox potential. Its advanced design, including the double junction and gel-filled electrolyte, makes it particularly beneficial for those seeking a low-maintenance yet highly accurate solution to ensure the health and stability of their reef tank, especially for systems with sensitive corals or fish where stable ORP levels are critical.