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 & Freshwater

🐟🌡️[Accurate Temperature Control +-1 °F] 🐟 It ensures the water temperature is accurate at the setting temperature +-1°F. 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 your aquatic fishes, betta, turtle

🐟🌡️[Upgrade Intelligent Safety Protection] 🐟Protection against overheating, Over-temperature, and lack of water protection, Anti-dry burning functions. Safeguard your fish and aquarium with advanced safety measures. When the water temperature exceeds 94℉, the LCD digital display will display HH and keep flashing to remind. When the digit heater detects the fish tank's lack of water, it will auto-shut off

🐟🌡️[Heating Fast & Keeps Stable] 🐟Enjoy fast and efficient heating with the AHJ aquarium heater. Quick temperature adjustment, hassle-free setup. Experience rapid heating for your 40-70 gallon (recommend 300 watts). If you are not sure which size and watt suits your fish tank, please measure the L W H, and contact our customer service

🐟🌡️[External Controller Easy to Use] 🐟The heater must be fully submerged to work properly. Conveniently adjust settings by the external controller without wetting your hands. Press the setting button, the thermometer will change 1℉(63℉-93℉) cycle setting. Red LED light on means the heater working and the water is heating. Blue LED light on means the water temperature is kept constant. Very convenient to read and compare the temperature from LCD screen

🐟🌡️[High Quality with Longer life span] 🐟Before the digital aquarium heater delivery, we have 100% conducted a 72-hour heating test in water to ensure the safety of the product. Using a thick quartz tube, 1.5m/4.75 ft cable(U.S. UL Certified), high temperature resistant protective case which Prevents water plants from adhering to the quartz glass wall and protects small fish not touching the quartz tube