气泡水平仪，你必须在一个视图中的所有传感器。水平，垂直，45°显示，水平尺，人造地平线，所有角的迹象和一个校准的标尺。
本文介绍了常用气泡水平仪的基本构造和测量原理。并且介绍实验室条件下对水平仪的调校方法。
In the paper, the bubble level most in use is explained for its basic construction and measuring principle, and the adjusting method under conditions in laboratory.
研究人员也安装了“斜面”传感器（类似于数码气泡水平仪）用以监测邻近的费利比高速大桥底部的未成形裂纹。
The researchers also installed “incline” sensors (akin to digital spirit levels) to monitor cracks forming underneath the adjacent Ferriby Road Bridge.
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