Product review (5 stars): Great Hygrometer
I purchased the unit to monitor humidity levels in my home as I suspected the my current monitor was incorrect. I was pleasantly surprised the unit read within 0.5% of the reading from a calibrated hygrometer used by an industrial hygienist evaluating air quality at my home (my current monitor was off by 4%). The unit is small, has no power cord to deal with, and can be used free standing or attached to any ferrous metal surface magnetically. I have mine attached to the refrigerator in the kitchen. If you have an HVAC humidifier and no clue as to the humidity in your home, other than static arcs or condensation on the windows, you should consider buying this unit. For the price you cant beat it.