Optical grading is the most accurate method for sorting large batches of tubers and bulbs, such as potatoes and onions. GeJo Grading has developed the Smart Grader for this. The machine sorts the tubers and bulbs very accurately by diameter, length, shape and visible defects such as cracks, bumps, scabies, wireworms or damage. In addition, the Smart Grader can also sort stones and clods from a batch.