Oligoscan is a spectrophotometric device that reads the optical density of tissue at four points on the palm. In under thirty seconds, it returns a quantitative reading of 20 essential minerals and 14 toxic heavy metals, measured at the cellular level, not the bloodstream.
This matters because your blood is constantly buffered by your body to maintain homeostasis. A "normal" blood reading does not mean cellular sufficiency. Oligoscan reads what your cells are actually holding, which is the level that determines how you feel and function.