Our feeding thermometer helps you select the proper seasonal fish food to help keep your fish healthy. When the water temperatures begin to drop below 50 degrees in the Fall, the fish's metabolism will slow. Switch to TetraPond's most digestible food, Spring & Fall Diet. Stop feeding entirely when the water temperature is less than 39 degrees. In the Spring, when the water temperature is between 39-50 degrees resume feeding with Spring & Fall Diet. When temperatures are above 50 degrees use any TetraPond food of your choice. Our thermometer features an easy to read color coded feeding range and the 6 ft. nylon cord makes it easy for you retrieve the thermometer from your pond.