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prism level

noun
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Definition of prism level

: a dumpy level with a mirror over the level tube and a pair of prisms so placed that the position of the level bubble can be determined by the levelman without moving his head from the eyepiece

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“Prism level.” The Merriam-Webster.com Dictionary, Merriam-Webster Inc., https://www.merriam-webster.com/dictionary/prism%20level. Accessed 14 December 2019.

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