I found a picture of the items, here:
http://img2.ssprd1.net/harte-as/usps...0/index_01.gif
(it's an animated .gif -- the 3rd image shows the "scales")
It's a set of 1, 2, and 3 pound "scales" that basically look like nicely engineered plastic pieces that flex when a certain weight is applied. It looks like you can ONLY use them to find out if the item is more or less than 1, 2, or 3 pounds.