This works great. We make our own colloidal silver and it tests the ppm so we can determine what strength we are producing. It's very easy to use and really couldn't be simpler. The price is very reasonable and I would definitely recommend this counter. You simply open the cap, dip it in the water and hold it for 30-60 seconds. Your parts per million will be displayed. You shake off the water and store it between uses. So easy!
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