JW Pet Company Smarttemp Thermometer Aquarium Accessory

good for tanks with very thin glass.. but anything larger then say a 20 gallon and it falls off.. magnets are just not strong enough.

While this thermometer is a good concept, with the magnet outside attaching the thermometer to the glass inside, it hasn't worked at all for me. I attached it to my newly filled tank for my betta and it read eighty degrees. The temperature wasn't changing as I let the water sit, so I decided to test it by turning my heater on. While I definitely noticed a major difference in the water temperature, the thermometer still read eighty. I bought it from a local pet store, and I will be bringing it back.

I previously had a thermometer than stuck on the outside of my old tank, and I was much happier with it. Despite the fact that it is inconvenient as it can't be removed and reused, I will be buying a new one for my new tank in place of this.

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Very simple but great! I have one in every one of my tanks they are great and easy to use and move.

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It's a good size thermo, but then it's easy to read. I put it on the side back of my tank so it's not that notice able. The magnet is so great compared to floating or suction cup designs I've used in the past.

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This is a great thermometer, but, if slid, it scratches acrylic. I took it off that tank and put it on a larger glass tank, and all is well. Just don't learn the hard way first!