modernlab instruments offer vortex mixer. the unit is for quick and thorough out mixing of liquids in test tubes, small flasks or bottles. the mixer consists of an enamel finished housing containing the motor with an eccentric drive to a rubber buffer on the top. the tube is held against the vibrating buffer and the intensity of agitation controlled by varying the position in which the tube is held. specifications : » voltage 230v / 50hz 110v / 60hz a.c. supply» grade - automatic» body - ms