i got my Lee scale in the mail today, set it up and i had the over head fan on, scale kept bouncing up in down b/c of the small amount of air flow in the room. anyways i wanted to test it out so i put a penny on the scale not knowing the weight of a penny in grains. it came out to 38.6 i then looked up a penny's weight. 2.5 grams which come out to 38.5809 grains. pretty close if you ask me.