All your cheap "electronic" scales are strain gauge based. They will always be prone to a wandering zero and many to interference from other electrical sources such as flouro lights. There is a reason that all serious scales are based on magnetic restoration force and these will never be cheap. The default preferred model over the last decade has been the AnD 120i which are over $1000. Sartorius make similar models.
It's a sad fact of life you get what you pay for in this regard. Hoards of reloaders have started out with cheapies, been disillusioned and eventually sucked up buying proper scales. Buy once, cry once..
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