This is a useful test to ensure that the tank is being kept at a proper pH. If your fish appear ill or stressed, it's one of the first things you could do to diagnose what's wrong. With proper water changes and cleaning, the tank shouldn't get thrown off to often.

Pros: Useful information

Cons: Not necessary frequently if other maintenance is kept up

Great for low maintenance fish care! Easy to use, instructions very clear.

Pros: Easy to use, instructions very clear

Cons: would prefer larger size

We put this in the tank and it reset the pH immediately

Pros: does more than just set pH

Cons: shouldn't use with aquarium plants