I never figured I really needed a gold test kit until now but I dug a gold chain stamped 14K a few weeks ago and I'm not sure if it's a fake or not. I tried the magnet test but it doesn't seem to be drawn to it plus it looks like a good bit of copper color, especially on the clasp areas. I heard from a friend that there seem to be quite a few fake chains around that are stamped with K marks. Anyway, the more I read about these kits I think only a basic acid test kit is all I need but I've seen some with needles and some without needles. Are needles needed or just a convenience? I know there are electronic kits but I think they are more than I need or want to spend. Thanks for any help. --Jerry