A computerized system for direct measurement of seedcotton yield was installed on a John Deere 299 cotton picker and on an Allis Chalmer 860 broadcast-header stripper. The measuring system has three main components: a) a weighing basket, b) a distance measuring device, and c) a computerized control/data acquisition system. A weighing response test showed an average bias of 4.1%. The average of these four measurements showed a 4.1% bias. Each measurement was obtained as an average of 10 3-sec interval readings (harvester engine running). Typical variability of 10 individual 3-sec interval readings was small (coefficient of variation near 0.1%). This computerized measuring system has been extensively and successfully used from 1995 to 1998 seasons for measuring experimental plot yields in Uvalde.