Marina Floating Thermometer (w/ Suction Cup) – A standard floating glass thermometer for aquariums that comes with a suction cup for optional attachment. It provides accurate temperature readings in both Fahrenheit and Celsius, helping you keep an eye on your tank’s water temperature. You can either let it float on the water surface or stick it to the inside of the tank wall. Knowing the water temperature at a glance allows you to make sure your fish are living in the correct range and adjust heaters or room temperature if necessary.