TDS3 meter arrived, findings from my experiment

Hi all, the learning process continues. The TDS3 meter arrived today, here's what I found:

Here's the thing I need some clarification on.  The CS that registered as 5ppm is an amber yellow color.  Sota told me that amber yellow means a higher PPM, not bigger particle size.  The first time I made the silver, I used the battery and the end result was clear, however I didn't have a meter at the time so I don't know what its PPM was.

If the amber color registered at 5ppm, my common sense tells me that the particle size is not optimal because bigger particles reflect more light.  Your thoughts? Perhaps I'll make another batch, with the battery again to get the clear solution and then test that with the meter...

As I would prefer to use the wall adapter instead of batteries, is there a recommended time to leave the unit on? The 2 hours using the battery seemed to have been perfect. I did two hours with the wall adapter and that's what gave me the amber colored stuff..