Rudi, I have been using silver estimator test strips for many years now. I am being told that they are not very precise, but they have been correlating quite well with sheets or films fixed numbers for me. I can read from 0.5 till 3g relatively easily. They used to be branded by Tetenal, and you can get them from Macherey-Nagel as Ag-Fix test strips, part 907 41. Silverprint sells them, too.
Originally Posted by Rudeofus