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Laboratory stirrers designed to stir liquids by spinning a magnetic bar immersed in the liquid solution. These stirrers typically consist of a tabletop electronic unit that creates a rotating magnetic field (using either fixed or rotating magnets), a plate (e.g., aluminum, ceramic) on which the container of the liquid to be stirred is placed, a spinning bar that is immersed in the liquid, and time and velocity controls. Magnetic stirrers are used in clinical laboratories to stir low- or medium-volume solutions; they are frequently used in devices that combine a hot plate with a magnetic stirrer in an integral unit.
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