Just keep rezeroing it. You're looking to put a given weight in. So it's aiming to pour that figure in from zero.
Shouldn't need to keep recalibrating it,unless it has a weight fault.
Warm it up as above, most scales will drift a little with ambient temp and humidity plus air movement.
If you wave (fan) your hand in front of a beam scale it will move....we are looking at tiny weight changes.
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