The HYDROS Control X3 by CoralVue is a compact aquarium controller that monitors pH and ORP while automating your tank's equipment. Along with a dedicated Probe Port for pH/ORP, it connects to two sensor devices — temperature sensors, water-level sensors, or leak detectors — and controls outlets for lights, pumps, feeders, and more. It suits both saltwater and freshwater aquariums and runs on its own or alongside other HYDROS controllers. Key features One Probe Port — accurate, reliable pH and ORP monitoring. Two Sense Ports — universal inputs for temperature, water-level, and leak sensors. Two Command Bus ports — link HYDROS controllers into one failsafe collective. Controls up to eight HYDROS WiFi devices — run heaters, pumps, lights, skimmers, and UV on rules and schedules. Alerts and notifications — the app warns you the moment something drifts out of range. Specifications Dimensions (L×W×H): 5″ × 2.7″ × 2.3″ Processor: fast dual-core 32-bit — on-device control decisions Health monitoring: internal voltages, currents, CPU status, and temperature Build: splash-proof and dust-resistant industrial enclosure Frequently asked questions Can the Control X3 measure pH? Yes. Its dedicated Probe Port monitors both pH and ORP, and its two Sense Ports handle temperature, water level, or leak detection. How is the X3 different from the X4? The X3 has one Probe Port and two Sense Ports. The X4 doubles up with two Probe Ports, four Sense Ports, Drive Ports, and 0–10V I/O for larger, more demanding systems. Do I need extra modules to add sensors? No — HYDROS Sense Ports are universal, so most sensors connect in seconds with no coding. Want pH monitoring plus a full bundle? See the Control X3 Starter Pack or the X3 Pro Pack. Comparing models? Look at the Control X2 and Control X4. Shipped fast with expert support. Get your HYDROS gear from real reefers at Marine Concept Supply, with setup help when you need it and local pickup at our Wheeling, IL showroom.
