You'll note that your doctor's scale uses a counter-weight and levers to give you a reading. This is why the scale is marked in large, bold letters "Not Legal For Trade." They're accurate within a pound or so - which is fine if you're comparing weight of your body day-to-day, but not at all accurate if you're comparing 20 lb. When you compress the springs in the scale, and you need to realize that they're short springs with little vertical movement, they're going to be accurate probably within a pound. They're designed to give you weights in the 150 lb range. bathroom scales just aren't designed to parse out weights in the 20 lb range.
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