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BHumboldt Ro-Tap sieve shakers are used to test and separate particles using oscillating motion. These units are capable of holding a stack of sieves with different size openings and then separate the particles as the material falls down due to the aggressive shaking effect. Powered by a 1/4 hp motor, these shakers provide 278 oscillations and 150 taps per minute, and are available in 8 and 12 inch sieve diameters on Raptor Supplies.