Chakra Pendulums are great for checking personal energy or the energy of another person. They can also be used for general questions of pendulum magic.
Pendulums are traditionally used to obtain answers from one's higher self or as a conduit for an external higher power channeled through the pendulum. The pendulum can provide a good second opinion. It uses your own energy and as such should not be touched by others who may impart their vibrations into the pendulum and thereby reduce its reliability.