When at a local Kitchen shop some time back I came across a little gimmick spoon set called "pinch, dash, and smidgen". I bought them because the smidgen spoon was tiny, maybe 16th of a teaspoon. So maybe you might find something similar.
But what I have recently purchased is digital scales, and they measure in both oz and gr, and as little as 0.1g. It also has a tare option.
I bought it originally for my soap making, but the idea is that for small amounts, once we visually work out what we want, measure it on the scales, so that next time we have a reference as to just how much we used.
I put my finger in the pic, so you could see just how small these scales are. I purchased this one through e-bay for $7.00.