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Over heating heaters is a hobbyist nightmare. To protect your aquarium investment and live stock, this heater controller is a must. The digital controller maintains your heater within a safe temperature providing a healhty and stable temperature for your aquarium. Automatic shut off over heat protection will alert it's internal sound alarm and cease the heating process. A temperature probe is included to ensure a more accurate aquarium temperature reading. The three prong power receptacle works well with other compatible heating elements equal to or less than 300 Watts. Add a controller for double heating protection. If power is interrupted a memory chip is incorporated to resume users preset temperature once power resumes. Do not use with defective heating tubes. Defective heater tubes may be drawing excess watts and in turn make the MAX 300 controller fail.