BioMixer 3D Nutating Shaker Includes dimpled mat; ideal for mixing in blood & centrifuge tubes Tri-directional motion for thorough, uniform mixing Optional stacking platforms available Cold room and incubator safe The Alkali Scientific™ B3D1320 Biomixer 3D is a multi-functional shaker that provides a 3-dimensional "nutating" motion for thorough, foam-free mixing in blood and centrifuge tubes, as well as in a variety of flat vessels. The Alkali Scientific™ B3D1320 3D Biomixer comes standard with a 12 x 12 inch autoclavable dimpled mat to hold tubes in place when mixing. The Alkali Scientific™ B3D1320 Biomixer 3D offers a fixed speed of 24rpm and a fixed platform angle at 20 degrees. Stacking platforms can be purchased as accessories, effectively doubling the usable surface area of each model.