Like has been said already, electronic balances are quite sensitive to a number of things. Big factors in my soils laboratory environment are; keeping it level, drafts and vibrations. We use an isolated bench to keep the balance on and the more precise ones have a wee case to keep any draft off the sample and weighing pan.
Having a check weight to see how much it wanders is good habit to have too. Can be a projectile or something as long as it's the same one every time. What these chaps have said is all really good advise.
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