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The SKR-201 and SKR-202 are shakers which provide a smooth orbital shaking action with an orbit of 16 mm (0.63") and speed range of 30 to 300 rpm. These lab scale shakers have powerful shaking but with smooth and quiet motion for long term use and can be used in environmental and CO2 incubators. Various tray/platforms are available—the carrier type platform has four rubber cushioned horizontal securing bars with quick release handles and can be easily adjusted (both vertically and horizontally) to hold most sizes and types of vessel, including flasks, bottles and beakers. The flask tray can hold different sizes of flasks by changing the type of clamps. There are two models to choose from. The digital model SKR-202 provides a digital timer with up to 9 hours of setting and speed control in 1 rpm increment. The SKR-201 analog model provides 2 hour timers (in 10 minute integral) and 10 step speed control at a very economical price.