MagTool Aquarium Auto Top Off System, Aquarium ATO LITE with Dual Optical Sensor for Both Reef and Fresh Tanks(Blue)Brand: MagTool Color: Blue Features: Dual High Precision Optical Sensors: Equipped with two advanced optical sensorsone monitors water level to trigger timely replenishment, while the other prevents overflows, ensuring your aquarium maintains a stable water level and avoids excess water spillage. Compact Design: With a minimal footprint of just 0. 8 inches, this ATO system features integrated 1mm high precision sensors, making it perfect for both