spirit level

noun Surveying.
a device for determining true horizontal or vertical directions by the centering of a bubble in a slightly curved glass tube or tubes filled with alcohol or ether.
Also called level.


Origin:
1760–70

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World English Dictionary
spirit level
 
n
a device for setting horizontal surfaces, consisting of an accurate block of material in which a sealed slightly curved tube partially filled with liquid is set so that the air bubble rests between two marks on the tube when the block is horizontal

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
We use spirit level surveys to measure elevation change.
Utilize plumb bob, gauge line and spirit level to obtain straight courses.
Verifies vertical alignment of posts with plumb bob or spirit level.
Included is a spirit level, adjustable leveling screws and a desiccator which
  can be readily inspected.
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