autocollimator

[aw-toh-kol-uh-mey-ter]
noun Optics.
an instrument combining the functions of a telescope and collimator, for detecting and measuring very small deviations in a beam of light.

Origin:
auto-3 + collimator

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Optical polygons are calibrated using an indexing table stack, an autocollimator and circle closure measurement techniques.
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