The JBJ Nano ATO Advanced Kit is a highly reliable auto-top-off system designed to maintain stable water levels in saltwater nano aquariums. This advanced kit automatically replenishes evaporated water, ensuring consistent salinity and reducing manual maintenance. It features dual optical level-sensors for precise water management, preventing both overfilling and water level drops, and comes with everything needed for quick installation. This system is reimagined with dual optical sensors to offer ultimate precision and security. An included protective cover shields the optical sensor from curious tank inhabitants and minimizes disturbances from light changes or water surface disruption, guaranteeing accurate measurements. Its completely waterproof design allows for versatile placement, and the robust magnetic mount securely attaches to glass thicknesses up to 15 mm. The JBJ Nano ATO Advanced Kit is an ideal upgrade for any aquarist seeking to enhance the stability and health of their nano reef or freshwater aquarium. Its compact design and advanced optical technology make it perfect for smaller setups where space is at a premium and precise water level control is crucial. By automating daily top-off tasks, this system provides peace of mind and more time to enjoy your aquatic display.