Product review (5 stars): Great when using a humidifier
This is a great gadget to have around the house.  I really rely on this in the winter when the air is very dry.  I run a humidifier to keep the air comfortable and keep my skin from getting to dry.  This gauge helps me know where the humidity is at in my room and whether I should turn up or down the humidifier.  It's important to not let the air get too humid or else you can get condensation on the windows that could lead to mold.  With this you will always know the humidity and temperature!