Started monitoring humidity and temperature moving to different places and different heights a few years ago to accurately rotate a large room when moving adjust the ventilation system. The digital display is easy to read without a "reader". They all show the same readings 99.9% of the time and are typically within 2% humidity and 1% temperature of our expensive HVAC system. Overall they work great although one of them just died after a few months of use. Four others run about 3 years on the same battery. Buy a few more as out of 8 bought 1 died.
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