Marina Aquarium Floating Glass Thermometer with Sucker, Transparent

Traditional method that will not go wrong like a digital version. Digital versions have let me down in the past or been extremely inaccurate so I would just get one of these, pop them in and you can’t go wrong. Accurate when checked against other methods, value for money & stickiness can’t be beat even after 1+ years. The ease of installation is unbeatable and can even be done by five-year-old. Performance and durability again is unbeatable as one year on, performing as well as day one and is still in mint condition apart from a little bit of algae - still doing its thing!

works well

I like this style of thermometer for my tanks, but the one thing that is frustrating is the sucker won’t stay stuck to the glass, although this is a little frustrating, the thermometer reads well and is accurate, you just have to catch it as it bobs around like a buoy, it’s durable, easy to install, great value for money and performs well and It’s appearance is ok in the tank, even when it’s bobbing

The suction cup works perfectly and the reading is fine, it has a green section to tell if the temperature is suited between 20C and 26C which makes it much easier for certain types of fish, the design is also perfect as it doesn't take up space or look ugly in the tank.

It's accurate and works well. Good for the price you pay and good durability. Easy to install by sticking to the glass and it stays there most of the time. (My fish do like to move it sometimes though haha) Looks natural in the tank too!

This thermometer working perfectly

Seems accurate, hard to read, most of the time floats around rather than sticking in place which I guess creates the bonus benefit of letting you make sure the water temp is uniform if you have a room sized tank and for some reason would gladly depend on something so simple....

Reliable thermometer, nicely designed, very readable, accurate, durable and sticks to the glass just fineGood value for money