Product review (5 stars): Because I highly recommend, I bought 2 more monitors for kids living ...
I bought because I needed to know indoor humidity levels, especially during cold winters when dry air from heat causes dehydration and cough. I was shocked to see that my humidity was at 26, when healthy indoor humidity is supposed to be at 45. I also bought a dehumidifier which reads 45  humidity level when the Vicks reads 50 to 60.

Because I highly recommend, I bought 2 more monitors for kids living away from home who were also dehydrated, with dry cough.