Laboratory stirrer designed for simple tasks for quantities up to 25L of water. It automatically adjusts the speed through microprocessor controlled technology within the speed range of 0/30 to 2000 rpm. Safety circuits installed ensure automatic cut-off in anti-stall or overload conditions. Continuous comparison of shaft speed to desired speed is maintained and variations adjusted automatically; this guarantees a constant speed even with changes in viscosities of the sample. cULus rated.