Heidolph REAX Top is a heavy duty, quiet running, vortex mixer with die-cast housing, providing a stable base. With an adjustable speed range from 0 to 2500rpm and 5mm orbit. Continuous or intermittent operation can also be set. The top cup can accommodate test tubes up to 20mm diameter. Overall 105 x 134 x 172mm W x D x H. Weight 3.3kg. For 230V 50Hz single phase supplies.