BBTO 20 Pieces Stick on Temperature Strip Adhesive Thermometer Sticker Aquarium Thermometer Sticker in Degree Fahrenheit and Celsius Display for Fish Tank and Aquarium

I ordered these to check the efficiency of my heaters. They work great and just like a mood ring. Great value.

Easy to apply.

Perfectly accurate when I compared to the standard bulb thermometers that sit in my multiple tanks. I also like that these go lower into the 60s than other comparable that only go to the low 70s because I don't run heaters in any of my freshwater tanks, so I need to monitor temps more closely in the winter. The only thing I don't like is that they're hard to read without shining a light directly on them.

Easy to read, with the colored squares. Easy to apply, just slap it on the glass. Good price for 20 pieces, but that ended up being a large quantity. I thought I would have to use a new sticker every time I washed my carboys, but they stuck on through washing and sanitizing just fine.

Perfect if you need to limit or the temperature in several rooms. Since these stick on any surface, you can put them in not so visible places too, like behind a door

The media could not be loaded.  I have a fish room and bought a bunch of these in hope to see the temperature in a glance but it is not always easy. If you see it in angle you almost can't tell the difference. you must see it perpendicular to the tank to see it. You also need well lit room to see it.It is hard to see on tanks that are on lower or upper level than eyesight and backlit tanks.Some people commented on the inaccuracy of the thermometer. I tested a few of them and do not see it to be the case.I calibrated these thermometers against my laser thermometer and against a couple others and found them to be fairly reliable. See my video.you can also see the difference between well front lit tank and back lit tank as far as readablity goes.This is specially true if you have tank that is behind a bright window. Good luck checking out the temp in that situation.I hope my review helps you decision.In the end I would recommend this given those above mentioned short comings.You can use them as long as you know what to expect.

They work great temp reads perfect, I would defiantly purchase this product again. Great product

Pretty much all black. Very little indication of a temperature reading. You have to really look hard, and then it's so faint you have no faith in the accuracy. I cannot recommend.

Does what you need

Great value & love both temperature scales!

Cant read the temperature at all. It doesn't light up at all. Have to use a torch and then barely can you see the temperature number. A total waste of money.