Product review (4 stars): Works well !!
It helped me to know whether I need a humidifier or not.  First I thought we have dry air in our house in Seattle, WA .....since I was coughing so bad.  Then, I bought a humidifier & used it for 2 weeks....no help.  Then,  I bought this monitor & I found out the humidity of our rooms are even more than 55 degrees !!!!  So I am not suppose to use any humidifier unless if I like to have molds on the walls !!!!