Product review (5 stars): TESTED & PRETTY DARN GOOD!
I hope this helps a lot. But for those who know about the Salt Test (https://ambientweather.wikispaces.com/Humidity+Calibration,+Saturated+Salt+Test) which basically measures the accuracy of your device. I have to say the Vicks Monitor is pretty much on the dot. It's been 75% or 76% for a few hours now in the bag... So yes I believe this product works very well!!!