A fish thermometer with alarms for high and low temperatures. And digfital, too. Easy to read thats for sure. Good idea.

Pros: digital is best

Cons: ?

Digital thermometers are easy to attach to a tank and last for a long time. They are much easier to read than the traditional types and can be tucked away in an inconspicuous area. A must have.

Pros: An essential for a fish tank

Cons: None

i like the other type better that shows you the red line up to the temp, but these work ok

Pros: seems to work well

Cons: i like old fashioned ones

Perfect for any fish tank. Helps you monitor the water temp in your tank.

Pros: easy to see

Cons: none