Pendulums have been used in magic and divination practically forever. They’re a very simple method for helping a person to try to gain information.
Have you ever been to a baby shower where someone put the mother’s wedding ring on a string and suspended it over her belly? It is said that you can tell if it’s going to be a girl or boy based on the way the ring swings. This common baby shower ‘game’ is actually pendulum divination.
That’s all a pendulum is—a small weight suspended by some kind of string-like item. You concentrate on questions and read the direction the pendulum swings to gain answers.