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介绍一种用于检定“智能大直径测量仪”的装置。该装置采用光电瞄准、光栅检测系统进行非接触测量，不仅结构简单，使用方便，而且具有较高的测量精度。
Introduces a device for verification of “smart large diameter gauge”. The device uses photoelectric aiming, grating detection system for non-contact measurement, not only the structure is simple, easy to use, but also has high measurement accuracy.