Excerpt from the book "Arqka Biological Architecture and Sacred Geometry" by Arturo Ponce de León, Ninón Fregoso and Michael Rice Acquire it here
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They are called dual or Rod rods. They are characterized by two equal metal rods in the shape of “L”, the shortest arm (about 10 or 15 cm.) May or may not have a handle and constitutes the handle. The long arm (measured between 20 to 40 cm.) Is the one that gives the answer. We have used golden ratio rods with good results. They are used by holding them by the handle with each hand parallel to each other. They can be used to measure energy from an object or person located in front of the dowser, or from the energy field of a place. Yes or no answers are also obtained as they are mentally configured by the dowser.