Try this:

http://boards.cannabis.com/recreatio...ift-scale.html

It worked for me, at least as far as I could tell. I'm not a scientific person though, so it could be flawed in many aspects. I still haven't bought the damn scale, being the forgetful person I am, so I haven't actually been able to check and and we are about 4 bowls into the bag.

Welcome to the boards.