It is suitable for head on shell on (HOSO) or head less shell on (HLSO) shrimp and prawn. The body of the shrimp grading machine is made by SS304 stainless steel, correspond to food hygiene requirements. The grader is consisted of two parts: elevating feeder and grading unit. Grading unit has 6 couples of roller which shape is up-thick and bottom-thin. The shrimps are graded by the gap between two rollers automatically. The gap is available to adjust. Total 6 grades and 5 grades are under controlling. Accuracy of shrimp size reach to 0.1mm. There are two kinds of roller material for optional. complete stainless steel roller or steel shaft with nylon covering, the rollers quantity can be changed according to grading capacity demand. The grading capacity can be customized from 500kg - 2500kg/h.