If you're going to have anything to do with Colloidal Silver , you have to buy one of these. They are now available at any incredibly low price of only $7.86 including shipping. I bought one of these and tested it, and it works just fine. It has enough accuracy to tell you what you must know about your Colloidal Silver . This is true whether you make your own from plans you see on the Internet or a simple kit or any of the generators that have been mentioned in this thread. If you're making your own, you use this to test for the quality of the distilled water that you're going to use. If it reads anything over two microsiemens, you're not going to be able to make very good Colloidal Silver . You don't want to have to wait until it turns yellow before you stop your generator. By the time it's yellow, the particles are too large, and the ionic value could go down. If you're using someone's generator, you need one of these to see whether or not it's working properly. You should also have one if you are going to buy colloidal silver by the bottle. If you don't have one of these, how do you know what you have bought? The only part of colloidal silver that is effective is the ionic portion, and that is what this instrument measures. When I first got into colloidal silver and wanted to experiment with different methods of making it, I had to pay $2000 for and an electrical conductivity meter. It was the only thing that was available, and it was a lab quality unit. Say what you want about the Chinese, they have managed to allow us to possess a unit that will do the same thing for under eight dollars including shipping.
Now if you look at similar items on eBay what is called TDS meters will show up all the way down to $.99. These are not nearly as accurate. A true EC meter reads in microsiemens which have a one-for-one relationship the silver ionic ppm. Many of you may already have the TDS meter and use it by multiplying by two to give an approximate figure for silver ion ppm. This is better than nothing. But for eight dollars, why not get a true reading. This unit also has temperature compensation which is necessary to get an accurate measurement. Some of the cheaper units do not include a battery, so after it arrives, you have to go out and buy a battery. This unit comes with one so you can put it right to work. The only difference between this unit and my $2000 unit is one decimal point.