The laboratory stirrers model LH and DLH are characterized by a high torque allowing their use with highly viscous liquids. The powerful motor with a sturdy construction is microprocessor controlled assuring a constant speed also if variations of viscosity of the stirred liquid occur. Choice of stirring speed between 50 and 2000 rpm. A progressive start avoids spillages of stirred liquids. A safety system against “over loads” protects the equipment in case of improper operation or motor failure. The quality of manufacturing materials allows a continuous noiseless and precise operation, absolutely reproducible. The manufacturing technology assures a safe and easy use with a limited volume and weight. The accurate ergonomic project, the modern and compact structure make these two models particularly attractive not only for their technical features but also for the nice design. The model DLH is equipped with two digital displays showing clearly the set and the actual speeds.