The Laboratory Sifter is used to determine the fineness of foundry sands. The sifter is designed to hold up to 11 standard half-height, 8-inch or 200mm diameter sieves. The Sand Testing Sieves, Model No. 42106A are purchased separately. A sieve analysis is used to check sand particle size and distribution and to calculate the AFS grain fineness number and surface area. The sifter consists of an electromagnetic vibrator and controls for regulating vibration intensity and frequency. A built-in digital timer controls the shaking time. (Note: sieves are sold separately and listed below.)