Thermometer
An aquarium thermometer is needed for determining the temperature of the water. These units are very inexpensive and should be considered a necessity. There are a few different kinds of thermometers you can buy.
Stick on glass
These are small thermometers that stick on the outside glass of the aquarium.
Hang on tank
These are a glass tube that are usually mounted on a stainless steel strip and hang over the side of the tank in the water to get the reading of the water temperature.
Floating Thermometer
These are also a glass tube that can float freely or be mounted to the glass on the inside of the tank with a suction cup.
Digital Thermometer
This is probably the most expensive of the bunch. This will have a probe that you mount in the tank with a wire that will run to a digital display that you mount elsewhere.
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