Laboratory sifter features popular design to effectively reproduce hand sieving. The sieve stack rotates while the sieve frames are tapped with plastic hammers. Capacity is 10 full height 8 inch (20.3 cm) or 6 full height 12 inch (30.48 cm) sieves with pan and cover; no clamping is required. For operator safety, switch prevents opening door while in operation. Unit features a switch to select 8 inch or 12 inch diameter sieves, and a 30-minute timer to set test duration.