The pendulum also has seven other crystal beads on the chain which match the chakra centres, this will only add to the pendulums power of divination.
The Merkaba is said to help one transcend into other dimensions, this actual style of Merkaba is usually based on protection and healing as it helps to connect one with the higher self and encourages spiritual growth.
When this happens one is able to feel and experience unconditional love, which in turn helps one to heal oneself and along with other beings in life.
The Merkaba is said to be able to bring forth the possiblities to create harmonious reality in any form in which one may desire.
The Merkaba is strongly linked to meditational practice because of the possibilities of transcending into other dimensions.
All of this can only help positively in being a tool of clear divination as the pendulum most certainly is, this will also encourage a strong "bond" with its keeper.
Please follow this link to see them :-