I have a lyman scale/dispenser.
It will wander off of zero if just given the compulsory 2 or 3 min warm up.
If I turn it on half an hour or so before using it and calibrate then zero its mint and doesn't appear to wander at all.
Drafts/wobbly benches/breathing near scale will all give inconsistent results.
Flouro tubes are sopost to be bad for making the power dirty or something but I reload underneath two big double tube ones and mine works fine as long as it has plenty of warm up time.
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