Just get a milligram scale. It's 18 fucking dollars. For real -- I have the same model from China, it works great: http://www.amazon.com/American-Weigh-Gemini-20-Portable-Milligram/dp/B0012TDNAM/ref=sr_1_1?ie=UTF8&qid=1368261673Note: if you want true 1mg level accuracy, you're going to have to go with a 5mg measurement and then cut it up into 5 equal piles. There's your 1mg measurement: the problem is that the scale generally won't register anything under 5mg. Also, now that I actually read your problem... this will still be off by 1-2mg sometimes. If you're dealing with a substance that you truly need 1mg accuracy for... I dunno. Ignore my suggestion, I guess?