Product review (4 stars): A Decent Product
I purchased this product to use in conjunction with dew-point charts. The buttons operate easily and the pen gathers the temperature and relative humidity quickly, although I've questioned the results more than once. The body is durable but the sensor in the tip of my pen is loose and contacts the sides--which may not be typical. The little replaceable watch battery only lasted about five months with hardly any use. Despite the weaker aspects, I think the tool works fine for gathering information in which a larger degree of error is tolerable.