High speed laboratory stirrer designed for intensive stirring tasks for quantities up to 20 l (H2O). It automatically adjusts the speed through microprocessor controlled technology within the speed range of 0 / 150 to 6000 min-1. Safety circuits installed ensures automatic cut-off in an anti-stall or overload conditions. Continuous comparison of shaft speed to desired speed is maintained and variations are adjusted automatically. This guarantees a constant speed even with changes in viscosities of the sample. - Cone seat for precision shaft. High speed laboratory stirrer designed for intensive stirring tasks for quantities up to 20 l (H2O). It automatically adjusts the speed through microprocessor controlled technology within the speed range of 0 / 150 to 6000 min-1. Safety circuits installed ensures automatic cut-off in an anti-stall or overload conditions. Continuous comparison of shaft speed to desired speed is maintained and variations are adjusted automatically. This guarantees a constant speed even with changes in viscosities of the sample. - Cone seat for precision shaft.