A pendulum can be used in various situations especially when you feel as though you require more clarity, connection and a better understanding of something. It can be used as a tool to tap into your subconscious mind which will allow you to find a simple yes or no answer to a question that you may have.
Questions could be about life in general, love, health, career and money.
Pendulum Boards are made for use with crystal pendulums as they offer more detailed guidance rather than using the pendulum alone. 
CLEAR QUARTZ:
Clear Quartz widely known as the 'master healer' because it is the most powerful healing and energy enhancing crystal. Not only does Clear Quartz balance the chakras, it also cleanses the aura and releases any energy blockages by absorbing, storing, releasing and regulating the energy flow.
Use Quartz to cleanse and rid negative energy and allow pure energy to manifest.