Posted by Mama To Many (Tennessee) on 05/30/2016

Dear Dave and Art or anyone else who makes their own colloidal silver,

Do you have a recommendation for a specific brand or model of instrument to test the PPM (parts per million) of homemade colloidal silver? I bought one from amazon 6 months ago and it has died. And it was not reliable for months before it died.

Thanks!

~Mama to Many~

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