A balance beam scale weighs in measures of grams. Your beams have numbers on them indicating measures of grams. Put your item to be weighed on one side of the scale and slide your beam slides until the scale is balanced. Once the scale is balanced, add up the amount of grams that have accumulated on the bars. If your 10 bar is at 70 and your 1 bar is at 6, you have an item that weighs 76 grams.