I have no idea what she means by this, because all scales measure the downward force being put on them, there is no top or bottom for that.
She may have been talking specifically about the fat-measuring part of the scale? Some scales have it on the scale itself and send an electrical current up through your feet to measure body fat (therefore starting at the bottom and going upward) while other have the hand paddles, which could be considered to measure from top to bottom. I don't know if this is what she actually meant, but one possible explanation.
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