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While made to be as acurate as possible, typical scales have error systematically as a part of their measurements. If you place an object directly on the scale, it will be effected by this error (keeping you from obtaining an accurate result). Instead, measure the weight of object A, then add object B. You are able to calculate the difference and obtain an exact measurement since both objects are subject to the same error.

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Q: How weighing by difference eliminate systematic error?
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