Take the Lee Safety Scale Challenge. Try this simple test. Cut a piece of regular writing paper 5/16 inch square. With your scale set on zero drop the paper on the pan to see if it moves. It should read about .1 grain. Keep adding paper squares until it does move. The total number of squares needed to move your scale is your scale's sensitivity. Some digital powder scales are only sensitive to 1/2 grain (FIVE paper squares). A Lee Safety Scale will move with the first paper.