The SpeedStir magnetic portable stirrer can be used with its own cylinder (#9198) and the cylinders found in the TFTestkits series.
Whenever a drop based test calls for the sample to be swirled, just push the button and watch this little device instantly and thoroughly mix your reagents into the sample. It's amazing how well it works.
Additionally, it contains 6 LED's in the base of the unit to light up your sample through the base of the cylinder, making your sample easier to judge when the color change occurs or when ambient lighting is poor.
Runs on four replaceable AA batteries and shuts off either by push button or automatically after one minute to preserve battery life.