Product review (5 stars): Accurate and Useful
This thing is super cool!  It's so convenient to be able to take it into different rooms of a house and see what the humidity level and temperature is.  Knowing the humidity is important to me because I take a medication that is sensitive to moisture, and it's just kind of fun to see the temp of a room so you can know how well a heater is working or something of the sorts.  It seems extremely accurate to me.  On a rainy day the humidity will go up, and if I put it in a dark closet the humidity always shoots up.  I also breathed on it one time and the humidity went way up.  The temperature usually matches up with my thermostat right on, so I trust it too.  It's a great little gadget that doesn't cost much and it got here in the usual two days.