I would never use one. I think I used one as a child once at my cousin's, and it answered a couple yes-no questions, gave a few names. Then I heard it was dangerous to use one, so I never touched it again. This is scaring me, as I am reading about it, and I am soon off to bed! I have tried a pendulum, and it didn't work for me. Often I would get negative answers when I used the Tarot. So I stay away from that which I don't feel comfortable. Very interesting, but again, not my thing.