These are great ‘sanity’ checks for your aquarium. Often we all get the stick on type that comes with the aquarium, but those are not always the most accurate. It’s a good idea to have at least one of these in your tank to get a more accurate reading, and to ensure your tanks temperature is really what you want it to be.
While these can be used floating, that isn’t very practical in a lot of applications since like a regular thermometer you must be looking at it from a certain angle to see the red line. It’s much easier if you use the supplied suction cup to stick it to the glass in your aquarium.
Do your fish a favor and look up their preferred temperature range, don’t assume that keeping the temp within the green area on the thermometer is “good enough”. Not all fish are the same!
These do not contain any mercury so they are perfectly safe for your fish.
A good way to get one of these is just to throw it into another Amazon order to break that $25 line for free shipping.
As always, if you have an questions feel free to leave a comment, I always give a response!
What to see more reviews? I have several more on my Reviews page.