Looks simple when the location of the target is already known.
This is a typical demonstration of the ideomotor effect, clearly showing that dowsing has more to do with psychology than treasure hunting.
The Zahori was a design published some years ago in Elektor magazine. The word "Zahori" means "Dowser", and this design was an attempt at producing an electronic dowsing rod for finding underground water. The theory was that there is an electrostatic field associated with flowing water that could be detected by electronic means. Of course, this is total nonsense, and we explored the published design here from a purely academic standpoint.
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