I remember i saw it once, you take a ruler a pen cap put the pen cap exactly on the middle of the ruler, than put your stash on one side and paper clips on the other, each paper clip is 1gram so you put as many paper clips as you need to balance the stahs with the paper clips. if it balabced when you put 3 paper clips, means your stash i 3 grams. have fun! edit: http://forum.grasscity.com/apprentice-tokers/440031-how-make-scale-pics.html