Looking for a gadget that will improve your beer? Make a yeast starter using The Stirstarter! Pitching a larger amount of yeast by growing your liquid culture in advance of brew day results in more vigorous fermentation and lessens chance of the development of off flavors. This unit has two powerful magnets in the 12V stir motor, which is controlled by a precision voltage regulator for easy speed adjustment. The RPMs of the drive motor are limited, so the motor will not "throw" the stir bar, yet it provides enough spin to get a good vortex going. A low voltage (110v), plug-in wall transformer provides power to the unit. The black plastic case dimensions are 6" x 4" x 2", large enough to accommodate a 2000 mL flask . A Teflon coated 1" x 5/16" stir bar is included.