The Precipitator I from Heemang Electronics USA Inc., of Los Angeles, is a highly effective visual demonstration device that’s used for displaying the differences in quality between a customer’s tap water and purified water. By simply inserting each pair of metal rods into each water sample and setting the timer, the device separates iron oxide from the water. The higher the TDS levels, the more discolored the water will become. Simple to use and incredibly effective, it’s a product that no field technician should be without.