Amer Thermal Instruments Liquid Crystal Vertical Aquarium Thermometer, Small

It worked as I was carrying it from the post office to my room but when I put it in the tank all it does is sit on the wall, the whole thing in a permanent shade of grey. Ten points for suction power though, it will not come off my tank wall no matter how many times I clean the tank.

i have two of these on the same tank, they both have the temperature dead on. For the money cant beat.

It's reasonably easy to read and reads precisely the temperature of my fixed-temperature aquarium heater. So either their both spot on, or their both wrong by precisely the same amount. Easy to peel and stick on the aquarium.

I bought this for my 1 gallon tank that I have a male Betta fish in. This Thermometer works very good. It shows the temp. accurately in Fahrenheit degrees (what I wanted). It is extremely easy to apply to your tank (just remove the sticker off the back & put it on the outside of your tank). It is small & a perfect size for my 1 gallon tank.

product is defective and does not work. it has been on the tank for over thirty minutes with no temperature indication. do not purchase. positive reviews seems to be fake.

It was super easy to put on the tank and is very accurate.

Easy to read. Accurate when compared with submerged thermometer. Great for small tanks. Non obstructive.

Works as advertised. My 6 year old can easily tell the temperature with this and enjoys keeping me informed.