Key Features Genuine Superfish submersible glass thermometer - sticks on to the side of your aquarium Readings in celcius and farenheit Sticks on to the side of your aquarium securely to make reading temperatures easy Has a green strip marked to clearly show the common average temperature range for a tropical aquarium Completely safe for fish and other aquatic life SuperFish Aquarium Thermometer This simple but effective aquarium thermometer is the ideal solution for monitoring the internal temperature of you fish tank. The thermometer is fully submersible and attaches to the inside of your tank via a suction cup. This keeps the thermometer fixed securely to the side of the tank making it easy to read at all times as well as incredibly simple to install. Also featured on the thermometer is a marked green section which clearly identifies the common average temperature range for a tropical set up and helps you to keep your tank at the right heat level consistently. Specifications