Pendulums are a tool to receive accurate answers for questions you may have.
How to use:
Hold the ball of the pendulum at the top of the chain, with your hand as still as you can make it. Clear your mind and focus on the question you would like to ask the pendulum.
As a rule of thumb, if the pendulum swings left to right, the answer is no and if it swings back and forth, the answer is yes. When it goes in circles, the answer is uncertain. The wider the swing of the pendulum, the more accurate the answer.
I recommend doing some more research about pendulums to see if they are right for you.