Provides mixing for diffusion, dialyzing, extraction etc. Rotation can be set from 5-50 RPM. Timer can be set from 0-99 hrs/1-59 min. Rotating disks for tube dia. 10-30mm. Plastic coated spring clips. Angle of rotation adjustable from horizontal for minimal mixing to vertical for full end over end mixing. ROTATING DISK MUST BE ORDERED SEPARATELY.