The one in Celsius didn't know that. The confusing instructions took a few minutes to understand. Works so far, but was only installed today. Quit in less than 2-3 months. This is the second one I've bought with the same results. It's not worth it. The digital reader reads the correct temperature, but my real thermometers all 8 read the temperature in the tank much lower. I have drugs in the tank because I believed the thermometer on the wall and such low temperatures. I will definitely not be buying again as both did what I bought!
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