when should you replace these types of thermometers?
I have one on my 55 gallon and it's been there for years, then I have two other ones inside the tank that are held magnetically. All 3 of them read different temps, and not by just a .5° or even 1°. They are all around 5° -8° different. I would like to know the best thermometer to buy, was thinking digital and hand held/portable but having a very hard time finding one like that.
asked 1 month ago
on ATI Aquarium Thermometer
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