heres what you do. you need a decent ruler, and something that can be used as a fulcrom (round chapstick container works)
next, the hardest part. is finding something that weighs a gram. you want it to be small...not spread out like a buss pass. Put the folcrum at 6in (whatever hte exact center is, some rulers go past 12"...or may be metric) when using it to weigh something, make sure you note where on the ruler you place the weed/counterweight. you wana keep them at oposit marks. so if you put the nugget at 1" make sure you put the counter weight at 11". you have to test-ballance the ruler yoruself, but if it balances..you got it weighed out.