Soil in sugar cane supplied to mills continues to be a major industry concern, causing wear on milling trains and in boilers, increased difficulty in clarification and additional costs and sugar losses in handling mud solids. Sugar quality is also at risk. Developments in harvesters have resulted in increased horsepower, pour rates and the ability to harvest under wet conditions. These factors have resulted in higher levels of soil in the cane supply. This paper describes the development of a commercial monitor for measuring soil in cane to within 1%.