Because cheap scales have pressure plates and the scales at the doctor's offices that are equipped with internal computer systems that not only judge the amount of pressure said body is putting on the plate but the amount of gravitational displacement that the mass standing on the plate is causing. Said scale calculates both the pressure and displacement into the most accurate number possible whereas the cheap scale just gives you the pounds of pressure on the plate.
Why a $12.00 bathroom scale not read the same as the doctors one?
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Because cheap scales have pressure plates and the scales at the doctor's offices that are equipped with internal computer systems that not only judge the amount of pressure said body is putting on the plate but the amount of gravitational displacement that the mass standing on the plate is causing. Said scale calculates both the pressure and displacement into the most accurate number possible whereas the cheap scale just gives you the pounds of pressure on the plate.
=_=