Sunday, August 14, 2011

What is name of that pendulum thing doctor's have?

it's usually in their office on a desk. mostly shrinks have it too. it has two silver that you take one in your hand and it knocks the other one when you let it go. LOL. that's best I can describe it, it's some type of hypnosis or maybe game. anyone know what the name of this thingy is? ty

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