Shortly after Christmas I treated myself to a set of old fashioned balance scales with metric weights.
Black cast iron, on a wooden base with a stainless steel scoop. The weights I bought are modern, cylindrical and come with a circular wooden box drilled to take each weight which makes it very easy to check none of the small ones have gone missing.
They are more pricey that most but I am sure more accurate.
After having tried two digital ones that stopped working properly, and spring balance ones that became unreliable, my new ones are sheer bliss. They measure accurately to 5grms, and you don't really need to bother with less accuracy unless you are a chemist or a crack dealer.