I have several of these, one led through the window seal to the street, while the other measures the temperature of the water at the outlet of the boiler. I live in the south and there are no particularly low temperatures here, but interestingly, he normally writes a minus, up to -9, and then the minus will overlap, so if -11, then it will be the number 1 with a small dash. and then everything is fine. The thermometer is accurate.
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