I've never tried making one, but I found this page on the net:

http://www.wecreate4u.net/dwilliams/scale/scale.html
benagain Reviewed by benagain on . Home Made Scale i was wondering if there was an easy way to make a scale from house hold objects, like not a digital one but something like the one with two plates and a fulcrum in the middle... something like that, any way i could measure by grams. a paper clip is a gram right? Rating: 5