With water temperature being such a critical factor for the well-being of fish its important to have a good thermometer. The Marina Floating Thermometer is the perfect way to make sure the water temperature in your aquarium is just right for all your fish friends! This Marina Floating Thermometer is designed to float in the water in a vertical position. It comes with a suction cup for optional installation on your aquarium glass. Accurate and easy to read it provides temperature readings in Centigrade and Fahrenheit. It also has a safety zone temperature range indicator for most tropical fish. For fresh or saltwater aquariums.For more fish tank accessories check out the other Marina products including aquarium filters filter media aquarium heaters aquarium air pumps aquarium lights aquarium thermometer and aquarium stands. Marina has a wide variety of products that are perfect for your pet fish or betta fish to enjoy in any large fish tank small fish tank or in a freshwater tank.