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There is a lag of sorts. Wen my dispenser is set for (as an example) 30 grains, the dispenser will churn out powder at a good clip, then will shift into a trickle mode until it stops. At that moment, the digital scale might read 29.8. But within a couple seconds, it'll show 29.9, and then 30.0. It won't change after that. So I know that, if the dispenser stops and the scale says 29.8, I can go ahead and pick up the pan, KNOWING that it would have eventually settled on 30.0. It's no different, really, than picking the pan off a beam balance while the needle is still oscillating a bit.
Several things will mess up a digital scale: air movement, static electricity and electrical spikes nearby. Keep it shielded from breezes, add a grounding wire if necessary and pay attention to nearby electrical appliances. Mine goes nuts when the clothes dryer kicks on, and used to when the (former) neighbor keyed his HAM radio. Other than that, no problems at all.
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