This clever effect is sadly not new with Tannen’s 🙁
The same basic method was actually created ten years earlier by Ed Mellon and engineered by James Swoger as Quantimental. In fact Quantimental is easier to set, more flexible, quieter, and has more choices.
However, even if Divining Rods is not as good as the original it is still a great prop and will certainly fool the average person. As we saw with the Jewels of Shah Jahan the problem with these clever devices that allow us to determine what the spectators have chosen is how to reveal them. I thought about a simple routine which I hope will come over in my Speed Demo 🙂
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