When placed over the 7 chakra centers the pendulum will move, showing both the direction and size of the energy the chakra is emitting. The energy level will reveal balance, imbalance, or energy blocks.
The chakra pendulum is a tool for diagnosis but the healing will occur by simply asking the body to realign itself. When you have addressed all the kinks, go back and ensure the chakras are all moving in the same direction and are about the same size.
Source and for more information about using your pendulum: Gaia.com