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Master your humidity levels with the AcuRite Pro Indoor Hygrometer and Thermometer. Equipped with a magnet on the back for easy placement, this small humidity gauge is ready for plants, cigars, guitars, or whatever you need to protect. This digital temperature and humidity comfort monitor combo is everything you need, with enhanced temperature and relative humidity accuracy within +/- 0.5Â° F and +/- 2% RH, respectively.