Pendulums are divination tools used primarily to answer yes/no questions. When you first try out a new pendulum, you should first ask it how it registers "yes" and "no" responses. Dangle the pendulum in front of you, let it come to stillness and then just ask, "Show me your Yes," see how it swings, and then ask, "Show me your No," and see how that swings. For most pendulums and most people, a circular motion is "Yes" and back and forth is "No." However, I have a friend who "programmed" e.g. instructed, her pendulum to swing up and down for Yes and back and forth for No, kind of like nodding your head Yes or shaking your head No. Another system I've seen is clockwise for Yes and counterclockwise for No. There are some people who use a pendulum radii, where you hold the pendulum over the radii and how it swings over the radii answers the question.
Pendulums are also used by police psychics to find the missing child, murder weapon, etc., and for this use you move the pendulum slowly over a map and see where it starts freaking out. You might use this technique to find a house to buy, or any other location-seeking question.
Another use for pendulums is for questions related to calendar dates. Say you are trying to pick a date for a party or garage sale, or when to pop the question, ask for a raise. Again, move the pendulum over the calendar in front of you and when it starts swinging crazy, that is the best date.
An old fashioned farmer's use for the pendulum is to determine the gender of eggs. Hold the pendulum over the egg and a circle is female and back and forth is male. This way you can use the male eggs for breakfast and not have too many roosters in your coop. Similarly, the nurseryman would use a pendulum to determine the gender of certain shrubs, for example when you want to make sure you buy a female Holly bush so it will have the ornamental red berries. Likewise, a pendulum made of a silk thread and the wedding ring would be held over a pregnant woman's belly to divine the sex of the baby.
Some people say that the pendulum is powered by the inner place in you that really knows the answer all along. Others say that each pendulum has a spirit that does the answering, and some spirits get along with some people better than others. In either case, the pendulum seems to "resent" being played with like a toy, and it will stop talking or give misleading answers if asked a series of testing, frivolous questions. So don't do that, okay? Good luck with your pendulum.
Natural Magick Shop pendulums are crafted with the same ritual care as the wands. I will keep the Swarovski crystal pendulums in stock on a permanent basis, all the others are on-of-a-kind pieces. I craft pendulums on Mondays and Wednesdays when the Moon is the very balanced half full phase.