The MagStir Genie can be used with any regular beaker and a maximum sample weight of 11lbs. The MultiMagStir Genie may be used with up to (4) 1L beakers and a maximum sample weight of 22lbs. High and low speed range including reverse and interval stirring for gentle stirring to aggressive mixing for vicious polymers. Units have three power levels for various sample viscosities. The low-profile stirrers use microprocessor control for precise and reproducible operation. Manual mode provides stir, stir reverse and time functions. Profiles mode allows users to quickly program speed, ramp rate, stir direction, time (including pause) and power level in 9 distinct steps. Up to 4 stirring programs can be saved. Automatic mode recalls and executes one of up to 4 user-defined protocols. Not recommended for cell culture. Specifications: Time: 1 second to 99 hours Power Level: Low, Medium and High Selectable Ramp Rates: 5-300 RPM/sec Memory: Up to 4 User-defined Profiles MagStir Genie: Stirring Speed: 10-1800 RPM Maximum Capacity: 11lbs Weight: 2.2lbs Dimensions (D X W X H): 7.9 x 6.3 x 2.2 inches MultiMagStir Genie: Stirring Speed: 10-1200 RPM Maximum Capacity: 22lbs Weight: 7.0lbs Dimensions (D X W X H): 14.8 x 12.8 x 1.9 inches