The Inkbird ITC308S is a reliable and easy-to-use temperature controller that provides on/off control of both the heater and cooler. The controller is fully submersible and features a durable aquarium probe that works better in water than standard probes. The dual display window allows you to easily see the temperature and set the temperature at the same time. The maximum output load is 1200 watts (110 volts), making it perfect for use in larger aquariums.