The thermostat probe records the temps. It has a max temp and min temp reading stored that you can display if you want wich you can reset any time. Its like during the day its set to 88.5 and 95% of the time I look at the thing its 0.0 - 1.0 degrees within what I set it for but once in a while if I check the max/min temp readings for daytime it might get as hot as 90.2 or at night its set to 82.0 degrees and 95% of the time its 0.0 - 1.0 degrees in range but if I reset the max/min temp recording to see the range at night it might have gotten as cold as 79.9 degrees. The amount it goes below 88.5 during the day or above 82.0 during the night would be about 1 degree from max/min readings.

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