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I suspect very strongly that zappers, especially the good ones can be very beneficial in helping to reduce these issues.
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I suspect very strongly that you say this to increase your sales.
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The best zappers will be highly accurate, down to below 0.1 percent or better. They will have multiple modes and a wide selection of frequencies.
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according to you, just to make your devices look good... But still after all these years, not one objective proof that any of the signal produced by one of your devices helps to get rid of viruses, bacterias, protozoas, yeast, parasitic worms, inside the human body.