A Selenite Sphere Pendulum is quite simply a tool that is used to check what the subconscious already knows. The Pendulum itself is an extension of our inner senses which creates a visual representation of our inner energy changes. The Pendulum amplifies small muscle movements that result from changes in the subtle energy flow through the body. Yes we are in effect making the Pendulum move, but on an subconscious level. 

Selenite is a form of Gypsum. It is a Guardian Solidifier Crystal. Guardian crystals are used in the physical world to protect your loved ones, your possessions, and your physical security. They are very useful in protecting houses and homes, property, and valuables. If you have prized possessions you want to guard and protect, use a Guardian crystal. They are also useful for travelers and adventures to take with them on their travels as insurance against harm. They are useful for emergency workers, soldiers, sailors, and airmen in the performance of their dangerous duties.