A shaker is mainly dedicated for larger vessel formats like 2, 3, or 5 L flasks or for very high numbers of smaller vessels like 50 x 25 or 50 mL. Depending on the type of flask used, you can change the sample tray and the fixation systems (called clamps).
By using eccentric drives, the orbital movement of the shaker keeps the samples in a constant shaking process. The orbit range is normally between 20 and 50 mm with a few hundred rounds per minute as max. speed. The shaking can last hours, days, or even weeks. The kinetic energy is an external force towards the vessel.
Besides the shaking frequency, measured in rounds per minute and orbital range, shakers with a housing can control different further parameters like temperature, humidity, or light. Basic platform shakers without a housing are limited to the shaking process.