Fluval EDGE Digital Aquarium Thermometer - 64 to 86 degrees Fahrenheit

I have one of these on all of my aquariums and they all work well. However, beware that they do not under any circumstances give an accurate temperature reading for the tank. I use them as a quick glance guide to make sure that the heaters are working to keep the water temp. in a certain range [since all my heaters are hidden from view behind plants]. Generally, these are off by +/3-5 degrees depending on the temperature differential between the ambient room temp. and that of the aquarium water itself. They seem to be most off when the room is cooler than what the aquarium water temp. should be. So, if you have a very sensitive system which must be maintained at a certain temp. [such as reef aquariums], do yourself the favor and don't rely on this to give you an accurate reading of the water temp. The best tool for this task is an in-aquarium thermometer.

This product definitely works, no doubt about that. I really think they could of done a better job giving you a more accurate temperature. I've noticed it's accurate within 2-4 degrees. The thermometer has such big jumps in the intervals, it goes from 64-68-72-75-79-82-86.

Other than the fact its not extremely accurate it works perfect for what I need. I just use it for a quick glance to ensure my heater is working, which is all I really need. I have a more accurate one I picked up locally that I can look at for more accurate reading.

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I agree with other reviewers that the temps this thermometer gives are not anywhere close to accurate, and they range from +/3 degrees from the actual water temperature. In addition, the spread of the temperature gauge is waaaay too much. Don't make the same mistake i did, enlarge the picture and look closely. The gauge goes from 64 degrees to 68 to 72 (etc, etc). What aquariast only wants to know the temp of their tank to within 4 degrees? Couple that with the margain of error of the thermometer and you're looking at a reading that is potentially 7 degrees different then the actual temp of the tank, which is more than enough to kill most fish. This thermometer is total garbage, which is exactly where i'm going to put mine.

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It's a good sticker thermometer for it's price, although glass is more accurate. But the guy earlier shouldn't have left a one star which is quite misleading...rating is for the item not for the description. Fluval products are reliable and produces positive results.

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Not as good as shown in the picture, the numbers are barely readable so as colors. I don't recommend this one, get ATI Aquarium Thermometer it's much better.

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