If you are still hand shaking your samples, invest in a hand motion shaker. This instrument can free up your hands, so you can become more productive by doing several tasks at once. Wrist or hand motion shakers are designed to simulate the back and forth action of the human wrist. The shaking angle can be adjusted on most models so you can achieve the desired action for your application. Hand motion shakers can accommodate flasks, jars, tubes, and vessels.