I have been using an old Pelouze scale (Balanced Beam). It is as accurate as the weights it came with. It is a pretty cheap scale (stamped brass and aluminium) but works a charm. I have seen them on EBay go very cheaply.

It is OK up to 50 grams, after that you need to measure in batches. The pans are a little small. But it works for me just fine.

- Mike