The W.S. TYLER® RO-TAP® Electronic Test Sieve Shaker operates with 8" or 12" diameter Test Sieves and offers precise sieving results. The RX-29-E compact (8" Test Sieves) unit requires minimal space on a laboratory countertop and designed for light to medium testing applications. The RX-30-E (12" Test Sieves) model is a floor unit. Controls can be remotely mounted for convenient operation.