Weight - Need an accurate pocket sized milligram scale

[motripo]

Hello,
Long time I havn't been posting on this forum (my gold member account has been deleted since then)
I know that is the place where I will get the best advices on scales accuracy so...

I'm currently owning a tanita scale, which has excellent reliability (are these still regarded as the best scales avalaible under 350$?)
However, I'd like to get a new 0.001 or 0.002g readability scale that would be pocket sized (the tanita beeing a little to big for my pocket). The smaller the better, but I do need it to be very reliable in terms of accuracy (will be weighing 4mg amounts) . Needed capacity: 10 g is ok, but 20g would be even better.

At the present time, I've found a few scales that could possibly fit my needs:

-the Gempro 50 scale
-the My Weigh MX-50 scale
-the GemLab digital carat scale
-the American Weigh DIA-10 scale
-the CSI High precision digital scale
-the Diagem II (CT50) scale

1)Do you know of any other pocket sized scales with 0.001 or 0.002g readability?

2)Among all these scales, which ones do you have experience with? Do you think they are reliable enough?

Thanks