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Biodots are very useful for determining your current state of stressfulness. Simply place a biodot on the back of your hand, near here the thumb joins the top of the hand. Biodots will usually register within 5 to 10 seconds. After the time has elapsed simply compare the color of your biodot to the chart that came wth your biodots, your biodot poster, biodot pocket guide, or the image below to tell your level of stress.