Hulda Clark developed this handy little machine..I built one in accordance with her schematic..actually I built a bunch for acquaintances..the one pictured is modified with a fifteen volt power supply rather than a 9 V batt. and it has two frequencies controlled by a switch 1,000hz and 20hz..Theory is lower the frequency the deeper the penetration..and the power increase about 10X with 15V supply..Kills bacteria and parasites a more in depth analysis can be found on Hulda 's site..I won't be without one..haven't been sick for ten years..
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