High accuracy (± 0.1 g) mollusks grader suitable for the careful handling of sensitive species (manila clam, European clam, cockles, periwinkle, etc.). Variable width, rod-based sieve shaker with optional electronic variable speed, capable of processing work loads of up to 5 Tm/hr. Powered by two low maintenance vibrant engines. Built with corrosion-resistant robust materials. Two to four grading sizes depending on product output.