AHJ Aquarium Heater for 40-55-75 Gallon, 300W Submersible Fish Tank Water Heater with Accurate Temperature Control, Over-Temp Protect, Auto Shut-Off, Quick Heat up for Saltwater & FreshwaterBrand: AHJ Color: Black Features: [Accurate Temperature Control + 1 F] It ensures the water temperature is accurate at the setting temperature + 1F. Different from others, thanks to the integrated design in which the PID temp chip and nickel chromium wires are connected directly. When the AHJ aquarium heater is in the water, it could detect the real temperature super fast and make regulations quickly. Ensure a stable and warm water comfortable for