Overhead stirrer for stirring liquids of medium-low viscosit(max 10000 mPa per sec). Suitable for volumes up to 25 liters (H2O), with speed adjustment ranging from 50 to 2000 rpm. The instrument can be safely operated continuously since it is equipped with special systems that block it in case of malfunctioning or heavy-duty work. Its progressive start-up prevents liquid from coming out of the beaker. The compact structure, microprocessor-controlled motor and safety chuck without key make the instrument particularly simple to use and extremely reliable and quiet. Ergonomic design, minimum occupied space and lightweight.