The Neptune Double Junction Lab Grade pH Probe offers precise and continuous pH monitoring for your saltwater aquarium. Designed for use with Neptune Systems Apex controllers, this probe provides the critical data needed to maintain a stable and healthy reef environment. Its superior construction ensures you receive reliable, real-time measurements, allowing for automated control of dosing pumps, calcium reactors, and other equipment tied to your aquarium's pH level.

This probe features a lab-grade, double junction design that sets it apart from standard single junction probes. The innovative construction places a second internal junction and electrolyte vessel, creating a formidable barrier against contamination from your aquarium's water. This significantly slows the degradation process, resulting in a probe that maintains its accuracy for much longer periods, requires far less frequent calibration, and offers a substantially longer overall lifespan.

This product is an essential upgrade for the serious reef aquarist who prioritizes stability and accuracy. It is ideal for hobbyists running a Neptune Apex system who want to reduce maintenance and gain confidence in their automated parameter control. If you rely on pH readings for a calcium reactor or want the most dependable data for long-term tank health, the robust and reliable performance of this double junction probe makes it a worthwhile investment.