How are instruments relying on force transduction calibrated to display results in mass units if they primarily measure weight?

Answer

They are calibrated against known mass standards under standard gravity ($g$)

Although force transduction directly measures the gravitational force (weight), the instrument is calibrated using known mass standards under standard gravity so that the resulting electrical signal is interpreted and displayed as a mass value.

How are instruments relying on force transduction calibrated to display results in mass units if they primarily measure weight?
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