I think the 'feet' on Bart's scale are contained within the mechanism, so the only stipulation would be that the scale be laying on a flat surface. With a bathroom scale (
@BartH 's other one
), the 'feet' or base is external, and reliant on a non-compressible surface, like you mentioned..
On the other hand, if the scale were laying on a bed of diamonds instead of just
grass...
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