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The system for delivering tracing caplets into grain on a combine was developed as a part of the grain tracing and recall system. A commercially available seed dispenser was used to meter tracing caplets into wheat in the combine bin tank during the unloading process. The caplets were delivered into the grain stream close to the unloading auger to attain uniform distribution. The distribution uniformity of caplets was sampled on five consecutive bin loads, with six one-liter grain samples from each load. The number of caplets in the samples was reasonably consistent at unloading time from 10 to 40 sec. when the grain unloading rate was stable. However, caplet concentration increased as grain flow subsided at the end of each unloading event.