UltraCruz® Mini Vortex Mixer is designed for shaking test tubes and is the ideal choice for every lab because of its compact size (less than 4 in. wide) and easy operation. It is perfect for the limited spaces of benchtops and fume hoods. With a speed of 2800 rpm and orbital diameter of 4 mm, it is capable of powerful vortexing for tubes up to 50 ml. The Insta-Touch™ pressure activated operation is smooth, quiet, and efficient. The motor is automatically activated with slight pressure on the center cup head. When pressure is removed, operation immediately ceases. The unique head design prevents liquids from entering the housing, prolonging motor life.