In yaesutom's defense, I'd like to say that once you've weighed out a lot of a chemical on a scale, you get a pretty good idea of what a dose is just by looking at it. I have eyeballed oral doses of foxy, 2C-B, 2C-I, and 4-AcO-DET for myself and others (when I did it for other people, I would refuse and say that I needed to wait for a scale, and usually they would keep harrassing me to eyeball it for them because they trusted me to give them a good dose), and there has NEVER been a situation where I gave people too much. In fact, I would even go so far as to say that eyeballing, done properly, is perfectly SAFE for snorting or smoking psychedelics, because you can just do a little bit at a time and titrate more effectively than with oral doses.