The first information available about the pendulum radiestetico date back over 2000 years before Christ, in Egypt. Just in the sarcophagi of the Valley of the Kings were found objects used as pendulums, and wands radiestetiche built with different materials and adorned with precious or semiprecious stones. There is no specific standard on the establishment of a pendulum, there are different types from the classic shape of a pyramid, with more details of spherical shape, brass, crystal, silver, wood, gold, with or without portatestimone. The only important thing and that the pendulum has a prospecting right to the table and the weight is not less than 12 grams. The length of chain or rope that is suspended is not subject to any rule, however, know that a chain is too long tends to slow oscillations, while a too short of the speeds. We can say that for a pendulum weighing 12 grams the ideal length should not exceed 20 inches.