Marina LCD Thermometers are available in a variety of temperature ranges and attach securely to acrylic or glass aquariums. Water temperature is a critical factor that is important to monitor for fish well-being. These thermometers feature large easy-to-read temperature readings in Centigrade and Fahrenheit, as well as a safety zone for tropical fish. Marina LCD Thermometers come with an adhesive backing and are ideal for both fresh and saltwater aquariums.