Product review (1 stars): Does Not Give Correct Humidity Levels
This monitor  is a joke as far as checking humidity levels.  The room temperature works perfect and when sitting on top of my home's thermostat they always show the same temperature within a degree.  But I bought the monitor to make sure I was within a healthy range of 30-50 humidity level with my room humidifier.  The humidifier has improved my breathing at night enough that I now sleep through most of the night but I wanted to make sure there was not too much humidity in the room because I don't want mold or mildew in the room.  When I first opened it up, removed the film layer from the front, and set it 2 feet from my humidifier.  It jumped up and down for a while and then settled at 22.  I had the humidifier on the middle setting, so I turned it all the way up.  I came back in a couple of hours and it said 33.  Perfect, I thought, it works.  I turned the humidifier up half way between the middle and full setting, came back in the room a couple of hours late and it was now reading 18.  Since then it has been between an 15 and 25 when I run it on the medium setting OR the high setting.  I have gone from waking up with a constant dry cough and dry mouth to never waking up with a dry mouth or a dry cough and my face even feels better, so I know the humidifier ( Honeywell HUL520W Mistmate Cool Mist Humidifier) is doing it's job, but this monitor is not doing its job.  A total waste of money.....and the really frustrating part is this is the one of the monitor models that Honeywell recommended in their manual to make sure your humidity level is kept between 40-60!!!!!!