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The Thomas Analog Variable Speed Vortex Mixer has variable speed of 300 to 3,200rpm (300 to 2,500rpm for 230V model) for gentle shaking to rapid vortexing of samples, and can be operated by touch or in continuous mode. This mixer comes with a cup head for mixing a single test tube, and a 3" diameter head with rubber cover for mixing a beaker, a flask, or multiple tubes. Additional interchangeable accessories (sold separately) are available for holding ampules, microplates, and other vessels. The mixer has a heavy-duty base that provides stability and minimizes vibration. A built-in temperature sensor shuts the motor down to prevent overheating. Vortex shakers are commonly used in laboratories to mix liquids. SpecificationsSpeed range300 to 3,200rpm for 120 V model; 300 to 2,500rpm for 230V modelMixing capacityCup head for mixing a single test tube; 3" diameter head with rubber cover for mixing a beaker, a flask, or multiple tubes; additional accessories are available (sold separately)Orbit4.9mmElectrical ratingAvailable in 120V or 230V modelsDuty ratingIntermittentDimensions5.25 x 5 x 8 inches (H x W x D)H is height, the vertical distance from the lowest to highest point; W is width, the horizontal distance from left to right; D is depth, the horizontal distance from front to back. Vortex shakers mix small amounts of liquid in laboratory containers for biochemical, microbiological, and other applications. A vortex shaker can be analog or digital and is commonly an automated, electrically powered, benchtop unit with a base that holds a rubber cup or a platform that spins off center. The user places a test tube, beaker