indicator a device for showing the operating condition of some system
carpenter's level a straight bar of light metal with a spirit level in it
surveyor's level surveying instrument consisting basically of a small telescope with an attached spirit level rotating around a vertical axis; for measuring relative heights of land
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Wiktionary
Substantiv
spirit level -
A tool employing a chamber with a colored liquid usually alcohol, hence spirit and an air bubble, used to determine a horizontal or vertical reference line.
