Bulldog tester models of the uni-flow, precision sizer and aspirator from Carter Day International, Minneapolis, Minnesota, U.S., offer full-sized components in a compact unit. Tester models provide a hands-on demonstration of the features and benefits of the full-scale machine. The testers can identify the percentages of separation to determine the best cylinder and shell size required for a full-scale application. Training is provided on continuous product flow, shell or cylinder changes and their effects on separations, maintenance and mechanical operations with minimal installation. The Bulldog models also allow for performance testing of incoming product and small-lot processing. Tester arrangements can be used for paddy rice, white rice, corn, wheat and specialty products.