USP (United States Pharmacopeia) defines a weighing guideline that uses a minimum weight requirement however, it is important to note that while this particular guideline is only relevant for pharmaceutical laboratories which must be in compliance with USP, it is only one example of a minimum weight guideline and is not the sole definition. Adopting a minimum weight requirement is a good weighing practice to ensure that your samples are being weighed according to your acceptable criteria for accuracy. While a balance's readability does not equal its accuracy, typically a balance with a smaller readability will offer greater accuracy than a balance with a larger readability (for example, a balance capable of reading by 0.1mg will be more accurate than a 1mg balance).Ībiding by a minimum weight convention will ensure a relative uncertainty less than some specified value. Semi-micro balances (those that weigh with a readability or steps of 0.01mg) are frequently regarded as being overkill or needed only for extremely sensitive weighing applications- but are they, in fact, the proper tool for the job?
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