Many reviews indicate that the temperature is slightly above the set temperature, which is true. But I found it's persistence, so once I have it where I want it I don't need to tweak it anymore. The instructions say to let it cool for 15 minutes after unplugging it before removing it from the tank when cleaning, and I did. No questions. It has a simple orange light so I know when it's on and I have a stick on the thermometer to check the temperature.
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