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定义
将测量结果通过一条不间断的、有文件记录的校准链连接到国家或国际测量标准，且每一级均有规定的不确定度。
解释
A factory floor caliper is calibrated against a reference gauge block, which was calibrated against a master gauge block, which was calibrated at a national metrology institute (such as NIST in the US) against the SI meter definition. Each step in this chain has a calibration certificate with quantified uncertainty. Without traceability, measurements from different facilities cannot be reliably compared.
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