Save yourself the headache and stop looking, cos there aren't any.

Get whichever one you want, price doesn't enter into it, they are all the same i.e. NOT calibrated for silver. Don't forget to double the reading though, that's accurate enough for home use.

EC meters a more expensive, just read the meter as is to give you a 'ball park ppm'.

Meters only get you in the ball park, they won't take you to any specific place *in* that park, for that you'll need a laboratory equipped with suitable analytical instruments and procedures.

What meter would I recommend? Your choice, every player wins a prize. If you're a home producer it's not about 'accuracy', it's about efficacy.

It can be done with a conductivity type meter and a carefully controlled process. However, you'd still need to establish a baseline, which would in turn, require some careful monitoring and calibration. ie, You could combine a theoretical calculation with a physical weight differentiation to get to what I'd call a close to accurate rating. ie, using a analytic lab scale(.1mg resolution is best), you could weigh your anode before and after processing to compare against your theoretical calculation. Keeping in mind that the weight of the anode will be influenced by oxidation and other impurities and that this will only get you an approximation(+/- 1-3ppm). Though close enough to give you a good idea of what your total silver in solution is. ie, never being more than... the total sum etc.

That being said, I've discovered that it is not possible to process anything beyond 19ppm without additives with the heat(98-100c) method and where the room temp solutions proved to have an even lower threshold(At or around 17ppm), before pooling and/or plating occurred.

Hope this helps.

PS. There is a Colloidal Silver generator company that sells HANNA meters with calibration fluid. Though it looks like they only claim this to work with there own generators. And so, not sure how much help this would be for someone making there own.

http://www.silvergen.com/ppm_meter.htm


http://silverpuppy.com/product/products/ec3-conductivity-meter