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Clip of Larry Gust describing the basic features & functions of a meter to test Body Voltage. The picture below describes this visually:

Here is a photo with the same principal. Red rod reading her frequency in her right hand & the wire going down her legs off the right of the picture is to the GROUND. The red box in her left hand is the Voltage Meter Larry describes in video:

Body Voltage To Do
Body Voltage To Buy/Get List:
*EMF meter that has Millivolts & Common
*Three Prong Plug, or rod to ground
*Wire - enough to reach plug or to outside
*banana clips/clamps (may come w/unit)
*metal hand rod
*walky-talky
*pen & paper
* flashlight (often test done @ breaker outside at night)
Resource List on DAY.org link above