The CoralVue Hydros iV Isolated Testing Vessel is an essential accessory designed for precise and interference-free measurement of critical saltwater aquarium parameters like pH and conductivity. It physically separates the test sample from the main aquarium system, effectively eliminating electronic interference from other equipment. This ensures more reliable and accurate data, which is crucial for maintaining a stable reef environment. The iV also facilitates automatic alkalinity testing and efficiently mixes the test sample for consistent results. Key features of the Hydros iV include its ability to isolate pH and conductivity readings, enabling interference-free measurements, and its capacity for automatic alkalinity testing. The unit efficiently mixes test samples and boasts a stable tabletop base, with the option for surface mounting. It is conveniently powered directly by a HYDROS Drive Port and is proudly made in the USA using additive manufacturing techniques. The vessel measures 4.5 x 3.5 x 7.5 inches (excluding probes and tubing) and includes two probe holders, four acrylic rods for tubing, a mixing pill, and a 150mL glass beaker. This product is ideal for serious reef aquarists and hobbyists who demand the highest level of accuracy in their water parameter monitoring, particularly those using a HYDROS controller system. It is especially beneficial for addressing issues like stray voltage that can compromise salinity and ORP probe readouts in a home aquarium. By providing an isolated environment for testing, the Hydros iV empowers users with dependable data, enabling better decision-making for dosing and overall system health, ensuring the vitality of their coral and fish inhabitants.