This method of divination dates back to ancient Egypt. Learn how you can use a pendulum, too.
I first learned about using a pendulum when I was about 16. A news-magazine television show featured a segment entitled "Are You Psychic?" with a list of questions designed to determine whether you were or not. The segment also described how to use a pendulum. Much to my surprise, when I tried to use the pendulum, it moved!
Basically, a pendulum is some type of a weighted object attached to a string or a chain. (I use a pendant on a fine chain for my pendulum.) Once you have assembled your pendulum, sit down in a comfortable position. Hold the pendulum by the string a few inches away from your body. You can used one hand to make sure the weighted portion is still.
Next, keeping the hand holding the string perfectly still, say to the pendulum, "show me yes". If it works, you will see the weight move, either in a circular motion or back and forth. Now ask the pendulum, "show me no". Once you have seen what "yes" and "no" look like to you (it can vary from person to person), you can start asking questions like "Is today the 15th?" or "Is my middle name Jane?"
It's important to relax and clear your mind so as to focus only on the question being asked when using a pendulum. It can be quite easy to project the answer you want into your reading, but with time and practice, you will start to get a sense of whether or not the reading is a "good" one.
The pendulum can be used to answer "yes" or "no" questions. If you ask a question and the pendulum doesn't respond, rephrase the question or ask again at another time. Basically, this is a tool to tap into your intuition, or alternatively, your spirit guide, to get information. For this reason, it works best if you are asking questions about things that are in your power to control, i.e. "Should I consider changing jobs at this time?" or "Is so-and-so someone that I can trust?" Asking "Will I meet my dream man/woman today" doesn't really work because that is not something in your personal realm that you can control. And, unfortunately, it can't give you this week's winning lottery numbers. (I know; I've tried it.)
Once you have some experience with the pendulum, it is possible to find out information for someone else if you know the person quite well. This is important because you are tapping into your own resources to find answers for the other person.
I understand that the pendulum has been used in this way since the time of the Pharohs. Check it out and have some fun with it, but always remember that it is you and your own free will that really controls your destiny.