Maintenance-free, 2mag stepper-motor drive for extremely slow and 100 % jerk-free, gentle mixing of cell cultures, with extended speed range from 5rpm up to 250 rpm, even and smooth stirring at slow speeds, power setting (10-steps) for high power when stirring large and viscous media volumes and reduced power for non-warming, continuous operation. Digital display for speed and power setting, SoftStart for reliable and safe acceleration of the stirring bar, QuickSet for rapid setting of start and maximum speed, memory of last working status when switched off, suitable for culture flasks with spinning propeller or spinning ball systems. 3 years warranty. Made in Germany. Please note: We recommend, due to reduced heat emission, the specially developed series bioMIXdrive for use in incubators.