Laboratory Rotator Lab-Line MAXI Rotator 4631. Missing rubber mat as shown. Used working rotator in good condition. 14" x 16" platform. 0 to 25 RPM. Ideal for hybridization blotting, staining and destaining gels, serological and other procedures that require a smooth, consistent mixing action. With a bi-directional movement, the mixing motion is a horizontal and vertical orbital rotation.