Management of moisture in cotton during ginning is important in determining fibre quality and the energy cost to the ginner. CSIRO with help from the Cotton Catchment Communities (CCC) CRC, the CRDC and Australian gin partners has developed a new moisture meter for gins. The meter measures the moisture content of seed-cotton or lint as it is moved quickly by air (up to 20 m/sec) through transport ducts between gin machines. Very good responses to fluctuations in cotton moisture indicates the meter can be used as a moisture controlling device. Such a system can be used to control driers and humidifiers.