Product review (4 stars): The hygrometer is fairly accurate if you know how to test it.
Like some reviewers, I got this weather station and it at first seemed that the hygrometer was inaccurate. This was based on comparing my reading to local weather station readings online. Most were not even close. The problem is that relative humidity is highly variable, and can change greatly depending on many factors, including the amount of grass and vegitation around your transmitter, soil moisture content, etc. The true way to test the accuracy is to determine the wet bulb temperature in your immediate vicinity. Along with the temperature, you can calculate what the relative humididty should be. After trying this, I found that accuracy of the hygrometer to be pretty much as described on the package (+-5%).