Product review (3 stars): This is my first wind meter so I'm not real ...
This is my first wind meter so I'm not real sure I have a solid base on which to compare it to. The temperature reading seem to be accurate, I compared it with an Acurite thermometer. I don't have another meter around here that measures humidity so can't compare for accuracy, but the reading that it was showing seemed consistent with the way it felt.

As to the wind velocity, I don't have another wind meter to compare it to, so I compared it (this three different times on three different days) to the personal weather station listed below which is roughly 3.5 miles from my destination as the crow flies. It consistently measured less than that weather station. One day when I tried it the wind was howling at 20-25 with gusts to 30, but the wind meter would only go to 19 max.

http://www.wunderground.com/personal-weather-station/dashboard?ID=KKSMOUND6#