This palmsize, magnetic stirrer will thoroughly incorporate each addition of reagent in a fraction of a second. No more manual swirling! Place the water sample on the mixing platform then gently drop in the Teflon coated stir bar. Use the pad to turn the unit on in well-lit conditions, When ambient light is poor, six LEDs below the mixing platform will light up to make color changes in the test sample easy to see. Press the same pad to stop the stirring action, or the unit will turn itself off after 5 minutes. (Do not submerge.)