It's hard to find the strength of CS. People often use a TDS meter. However, colloidal silver is silver particles that are suspended in solution – only silver ions are dissolved. So TDS meters will only measure the ionic silver strength, not the colloidal strength.
For more details, please check the link:
http://www.spooky2-mall.com/blog/how-to-find-the-strength-of-colloidal-silver/
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