I had bought this for my 55g and I love it. The only thing that bothered me was the suction cup didnt always stick and the thermometer was floating around.

Pros: accurate

Cons: suction cup doesnt stick good

this is OK but sometimes changes drastically in a shorrt amount of time so i dont know if it is accurate

Pros: nice to tell temp

Cons: not sure how reliablw

this is great to save on electricity plus if your lights go out no worrys

Pros: perfect

Cons: n/a

This works great.

Pros: Easy to use

Cons: none

The suction cup is junk and it will not handle too many dunks in salt water with out problems. Alright for the price though.

Pros: accurate, good battery life.

Cons: not water proof