Petco Outside Thermometer for Fresh & Marine Aquariums

i don't know if i got a defective one, but all the colors of each degree are light up brightly or sometimes they're all dim. so its hard for me to determine the temp. i had another one before from the 99c store and that one worked better than this

This is really not a bad thermometer for your tank, and it will read the temperature rather quickly and shows very little contamination with temperature from the air outside the tank. The adhesive is strong and will stick to the tank; you only need light pressure to affix it to the glass. If you use a tool like a Mag Float-130A Magnetic Cleaner for Acrylic Medium up to 125 Gallon you won't need to worry about rubbing it off of your glass while cleaning if it is bumped.

I have two of these on both ends (each side) of my 90 gallon aquarium near the live sand bed. This helps me get a good read on the temperature at the lowest level of the tank and see if there is any temperature difference between the two ends. It is very unobtrusive and easy to read in good lighting. I have noticed that on one side of the tank I have a harder time gauging the temperature because it's mostly in shadow. The colors aren't terribly bright for the temperatures and as such it can be a bit finicky.

I ran a few tests with these against the floating variety (see review here: Floating Thermometer Economy) and found these superior at determining temperature both for their speed and accuracy. To sum up I raised the water temperature in an empty quarantine tank and these register much faster. Obviously your secondary worry with an outside of the tank temperature strip is going to be whether or not the room temperature affects the readings. If it does, this is negligible, I cranked my heat up to bring the house to 85 F and the strip never showed a difference from the steady 75 F that I keep it at.

For a cheap solution or secondary system to check your temperature I would suggest these, they aren't the best, they aren't the worst, but they are reliable.

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It works OK. Not the best or worst. But when attached don't pull it off. It will break. But its very cheap.

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I have this thermometer on my old, smaller tank for my betta, and I love it. Unfortunately, it cannot be removed and placed on another aquarium and still work. Because of this, I went out and bought a SmartTemp Thermometer, at a pet store closer to my house than PETCO, when I got a new larger aquarium. I miss my PETCO thermometer! While it can sometimes be difficult to read (sometimes a lighting problem, other times you have to rub it and let it readjust to show the temperature), I have still found it to be very reliable, especially for the price! I will be returning my Fusion Smart Temp Thermometer and replacing it with either another one of these, or trying a ESU Coralife Digital Thermometer item #232. I would definitely recommend this thermometer, though.

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