Bonus: Balance-beam scale
If all you want to know is your precise weight, nothing beats the accuracy of a doctor’s scale.
Invented in 1917 by “the best scale man in the country,” Mathias C. Weber, the Health-O-Meter or balance-beam scale, is tall and stately with that shaky bottom plate and little slider on a beam. It compares the masses of two objects (one being your body) on opposite sides of a beam; as the beam pivots on a fulcrum, a counterweight slides until the beam stops moving, and you have your weight.
It’s also low maintenance: Place it on a flat surface (use a level), keep it away from drafts (which can affect the beam), and zero-out the counterweight (turn the little “balance-ball screw” knob on the side).
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