Test tube mixer is useful for stirring centrifugal tubes, test tubes or small flasks, Fitted with Neoprene rubber ucp mounted eccentrically on the shaft against which at its is held the tube with its lower end pressing against the cup. . Fitted with speed control arrangement. Mixing action is controlled by varying the angle and pressure of the tube against the cup. Work on 220/230VA.C.supply. The housing is 150x150 mm.