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.
~Mama to Many~