I have three scales: A kitchen scale for 100 g up to 3000 g, then a "toy" scale for anything from 2 g to 100 g in 0,1 g accuracy, and finally a gunpowder scale for anything in really small quantities, with 0,01 g accuracy and proper wind guards etc. So far, I have only really needed to use the latter for phenidone, and I suspect when I get round to gum printing again, I'll use it for the pigments. The rest is not that critical, and in many cases it is easier to work with solutions and pipette an accurate volume rather than bother with weighing.