2. Electronic level of DS05 and above shall be used, and the instrument and supporting level shall be within the valid verification period. Before and during the use of the level gauge and the level ruler, they must be regularly calibrated and qualified. The angle between the sight axis of the level gauge and the axis of the level tube shall not exceed 15 ". Various settings of the instrument are correct, among which the items with limited difference requirements are set in the instrument according to the specification requirements, and are automatically controlled during data acquisition. If the requirements are not met, retest shall be conducted according to the prompts of the instrument.<br>
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