These space-saving FINEPCR Compact Vibrating Shakers have a smooth vibrating motion and small orbit for effective mixing. Easily adjust motion from 0 to 2000 rpm. Perform timed studies with 0 to 60 minute timer; or run continuously. Included standard platform accepts two microplates. Easily install microplates or optional rack for up to 15 1.5 mL centrifuge tubes (EF4891) using the simple spring holders.