I don't have that TDS meter but, on mine (Easy TDS)I get varied amounts. Anywhere from 10ppm to 14PPM after a few hours of "cooking". But I read somewhere that PPM can vari with water temperature, ph and other factors. Probably why I lose some PPM when I test the same batch a few days later.
I have a question of my own. TDS meters measure Total dissolved solids. So, since silver is not dissolved, it must be measuring the ionic content right? And if so, wouldn't you have to divide the figure you get after multiplying the PPM readout by 2.5 to then get 5-15% of THAT figure since they say you are usually getting 5-15% particles and 80-95% ions.