vernier graduation
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简单的游标尺的刻度清晰，具并且可见度很高。
The simple Vernier scale is clearly marked for good visibility.
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刻度和游标都装有微动调整和锁紧装置，进行精细调节。
Both the graduated circle and vernier are equipped with fine adjusting screws and locking device so as to achieve fine adjustment.
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