Product review (5 stars): Pretty Accurate
I just bought this and it seems to work well.  The temperature reading is pretty much spot on with our thermostat.  I have nothing to compare the humidity reading to, but I think it's pretty accurate as well.  We live in a small apartment that isn't very well ventilated.  We had a problem with mold so I bought this to monitor the situation.  The humidity reading fluctuates depending on how much cooking I'm doing and it changes regularly so I assume it's working.  I would recommend this product, it was reasonably priced and has given me peace of mind.