I was familiar with pendulums but didn't actually learn how to use one until I went through my life crisis.
Pendulum use, like any tool, becomes more reliable the more you practice. I have spent several years learning the art of pendulum dowsing. I use it to confirm, validate and discover all types of information, regarding: supplements, emotional blocks, physical ailments, lost objects, animal communication, energy clearing, chakra alignment, and more.
*Please see Disclaimers in footer.
I believe my pendulum is a tool - nothing magical. At the most basic level science explains how it taps into our subcounscious and the nervous system to effect the movement of the pendulum. What you accept past the scientific depends on your belief system. As for me and my experiences, I believe in divine energy beyond what science will prove. So I use my pendulum for subconcious work as well as communicating with my higher self and divine energy.
"Pendulum use has to do with electrical or force fields that surround all life such as the human aura and the pendulum acts as an extension of our mind in the way in can tune into and read these vibrations of the universe." From Pendulums.com
Whether it's a rock on a string or a handcrafted work of art, a pendulum is a versatile, typically portable device that utilizes gravity and momentum to respond to energy in a way that is meaningful to the pendulum user.
- From Crystalv Vault
"A TV antenna can pick up invisible rays and translate them into pictures, so perhaps the inherent electrical current of the brain can also act as a receiver for which the pendulum serves as a transmitter.
But regardless, even if you do not understand how the pendulum works, just as most people don't know the inner workings of a television or telephone, you can still benefit from its use.
You do not have to be psychic to use a pendulum; there is nothing magical or mystical despite the fact that friends and family are always amazed at its uncanny accuracy.
How you believe it works may be secondary to the fact that it actually does work - and you can experience it for yourself."
From Ask Your Pendulum.com