The Determination Board is an ingenious tool for measuring the acid/alkaline nature of an organic substance.  This is the original design that I make:

Behind the upper circle and lower protractor are two rings of 10 gauge copper wire connected by a straight copper wire.  Therefore, anything placed in the upper circle can be measured with the protractor.  A Parcells pendulum is used to perform the radiesthesia.  I make a variation of this design by engraving the protractor numbers into the acrylic.  This is version 2:

I also make a third version:

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