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Even with a balance beam, who is to say that beam was properly calibrated at the factory and the markings are in the exact right spot?
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Well, exactly - not to mention that it might well be on a surface that isn't absolutely dead level, which is why these beam scales have a "calibration" screw in the base.
Fact is, we should all have (and frequently use) reference weights to calibrate our scales and correct the inevitable drift which is bound to happen over time.