I've always used my digital powder scale. Any good quality powder scale is plenty accurate for gold and silver. Unless you want to weigh large quantities, then I don't have one that goes over 10lbs.
I should have a problem like needing to weigh more than 10 lbs of gold ...
Perchik: Money is the world's curse.Tevye: May the Lord smite me with it! And may I never recover!