Don't listen to these fools, do it the easy way.
Get one of your marijuana dealing friends to lend you his digital pocket scale, get yourself hard, and just put it on there without adding weight to it. Then before you give your scale back to your buddy, don't wash it off and tell him you weighed some high quality greens on there, and that there are crystals all over it, he shouldn't wash it, but lick it off instead cause they are too high quality to waste! He deserves it for lending out his scale anyhow..
