"I cant stand these things. You never know what temp. its really reading, your room temp. or the temp. in your tank. And they are so confusing for me to read. Mine show three different colors at the same time, so Im never really sure where the temp. is truly at. The ones that go in the tank are easily hidden. I am always distracted by these stuck on the side. Not to mention you only have one chance to stick it on, and its easy to get it slanted."