Glas-Col's Bench-Top Shaker is an adaptable, user-friendly shaker that is capable of many hours of continuous shaking and mixing. This shaker features a variable-speed motor that provides gentle, low-speed shaking to vigorous, high-speed shaking. It requires no load balancing. Built-in shaking head with easy-to-adjust knobs for quick loading. It will accept a variety of glassware holders for mixing and shaking. Unit may be placed inside a fume hood for added safety. Strong, heavy-duty construction permits maximum loads of up to 20 pounds. Motor speed is adjustable to 125 rpm maximum.