The CoralVue Hydros Triple Optical Water Level Sensor HDRS-LS3 is an advanced monitoring device designed for seamless integration with CoralVue Hydros control systems. This innovative sensor provides crucial water level detection for a variety of aquarium applications, such as automating top-off systems or monitoring the levels in dosing containers. It connects directly to any Sense Port on a Hydros device like the Control XS or X4, eliminating the need for an additional power source and offering three redundant sensors for enhanced reliability. Boasting a robust design with no moving parts, this sensor ensures long-term reliability without the risk of mechanical failure. Its optical eye is magnetically coupled, featuring a slim 1/4 inch thick magnet mount that can secure to surfaces up to 1/2 inch thick, including clear, tinted, or painted glass. The sensor operates flawlessly in both daylight and complete darkness, making it ideal for discreet placement inside aquarium stands or the back chambers of all-in-one tanks. With a 0.75 inch diameter and thickness, a 75 inch cord, and a GX12 aviation-style connector, it maintains an IP65 rating for durability in freshwater and saltwater environments. This triple optical water level sensor is an essential upgrade for any reef hobbyist utilizing or planning to implement a CoralVue Hydros controller. It provides unparalleled peace of mind through its redundant sensing capabilities, safeguarding against overflows or critical low-water events in sumps or reservoirs. Its ease of installation, repositioning, and cleaning, combined with its ability to function in any lighting condition, makes it perfect for those seeking a highly reliable and versatile solution to automate their aquarium's most critical water level management tasks.