Originally Posted by gmcttr
And DON'T sneeze!
I have to agree with the others that there's simply no need for that kind of accuracy. Even if you use 1/10g weights as you suggest, the scale will probably still be off by several 1/10ths. If it reads 20g, the actual weight could be 19.5g-20.5g.
Correct. Conventional wisdom in the laboratory says that if you want reliable accuracy, the scale needs precision ten times greater than the level of precision you are seeking. Therefore if you want true reliable 1/10's gram, you need a scale that can read 1/100's gram.
Those come with a hood over scale to prevent air currents in the room from moving around the down you are trying to weigh.
All this said, such accuracy is not needed.