I've only used these thermometers in my betta tank for a few days so can't comment on their durability, but so far they seem to be decent, accurate thermometers . I have two of these installed in the same tank and both have the same temp reading, +/- fractions of a degree. They also matched the temperature shown on my more traditional mercury thermometer, which I placed in the tank for comparison. I will buy more for my other tanks.
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