XP Aqua: Duetto2 Dual-Sensor Complete Aquarium ATO SystemIntroducing the XP Aqua: Duetto2 Dual Sensor Complete Aquarium ATO System, a revolutionary solution for aquarium enthusiasts seeking precision and reliability. This all in one automatic top off (ATO) system features XPAqua's proprietary dual optical sensor technology. With two highly accurate level sensors integrated into an incredibly compact design, the Duetto2 ensures your aquatic environment remains stable and healthy. Key Features: Compact