With water temperature being such a critical factor for the well-being of fish, it?s important to have a good thermometer. This Marina Stainless Steel Thermometer easily clips onto the aquarium and provides accurate and easy-to-read temperature readings in Centigrade and Fahrenheit.
It also has a safety zone temperature range indicator for most tropical fish. For fresh or saltwater aquariums.

Other thermometers available :

11200 Marina Floating Thermometer
11201 Marina Floating Thermometer, with suction cup
11202 Marina Standing Thermometer
11204 Marina Floating Thermometer, large, with suction cup
11205 Marina Plastic Thermometer,