Abstract: A simple, rugged and inexpensive apparatus is provided by which the moisture content of any grain crop, various types of forage crops such as hay and straw, and the like, may be determined. The apparatus is portable, requires very little maintenance, and is as accurate as it is reliable. A crop sample of harvested material is placed in a confined zone through which warm air at a predetermined temperature is blown for a preselected period of time. The weight loss in moisture is observed and directly correlated to the remaining moisture content in the material.