The Chargemasters and the other brands in that price range will always drift. It's inherant in the cheap strain gauge technology used. You cannot avoid it. Individual units may be better or worse, I don't know. One that drift excessively may have a fault though.
I only use mine now to pre weigh my charges before finishing off on an AnD.
Like already posted you need to turn them on well before doing your loading. I usually power mine up an hour before needing.
My reloading room has a big window above my bench and I have to watch out for the afternoon sun as it comes around and quickly raises the room temperature. I don't think they have good temperature compensation.
Having said that the AnD has temperature compensation but in the situation above my AnD doesn't always compensate quickly enough for rapid changes. It does settle down eventually. I now prop a big square of cardboard over the window and that fixes the issue for both my Chargemaster and my AnD.
The old fluro light chestnut I have never found to be an issue.
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