I'm trying to use online lab software to do my assignment but I'm not sure if I'm doing this right... I'm to measure a copper slug (I think that's what it is) using a Centigram Balance. There are three rulers or whatever they are on this thing...the one in the very back is at 0, the one in the middle is at 2, and the one in the front is at .3. Would that be 2.3? And if so, is that 2.3 centigrams? EDIT: Same thing...if I'm weighing something and the back ruler goes to 40, the middle 5, and the front .2, would that equal 45.2?