Through the combination of theory and practice, this article discusses the relation and difference between indication error, maximum allowable error and measurement uncertainty. It is made clear how to correctly understand and describe indication error in the practical work.%本文通过理论与实际的结合，讨论了示值误差与最大允许误差、测量不确定度的联系与区别，明确了如何在实际工作中正确理解和描述示值误差。
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