I had all 4 in the same room, on the same level, 2 feet apart. I checked her several times a day for a week. The humidity was GONE. They range from 40% to 99% humidity at the same time. How can one read 40% and the other 3 in the same room read 60, 70 and 90%? The temperatures only differed by 1-3% degrees, but again, why? Why can't they have the same temperature and humidity? Then I forgot them and missed my return window by 3 days. Aggravating.
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