Vortex mixer gives instant, vigorous mixing action with just a touch of vessel to cup. No stoppers, rods, or finger capping is needed. Automatically starts on contact, and stops when vessel is removed. The mix is completely controlled by operator by just varying the angle of contact and pressure on the cup. Handy, automatic cup switch activates with light pressure. Accommodates centrifuge, square, or micro tubes, graduated cylinders or separatory funnels, Erlenmeyer and Florence flasks. A homogeneous mix is assured by the variable speed control feature. This mixer can’t be beat for reproducible, time-saving mixes. Two interchangeable mixing heads to handle more types of samples. You also have the choice of vortex mixing or lateral shaking, depending on your needs. The “constant on” setting can be used for continuous operation. The unit comes with standard cup for single test tubes and a platform head for beakers, flasks and multiple test tubes. Heads are easily popped on and off without the use of tools. Housing of cast iron on sponge rubber feet. 115 volt, 60 Hz. Warranty: 2 years. CSA Approved.