The PETKUS P 12 grader is a universal cereal grader that has been tried, tested and used for high quality cleaning of a wide range of cereals and pulses, especially hay and fine seeds. The compact sorter can be used not only for pre-cleaning but also for intensive cleaning and seed cleaning. The P 12 sorter is preferable for use with mobile seed processing systems due to its low vibration level and compact size. This grader is equipped with a standardised screening system consisting of two screening boxes and three ball-cleaning screening layers.