borescope

[bawr-skohp, bohr-]
noun Optics.
an instrument using optical fibers for the visual inspection of narrow cavities, as the bore of a gun.

Origin:
1955–60; bore1 + -scope

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Example sentences
The drill holes were inspected with a borescope to see if grout material had
  penetrated to the location of the drill hole.
It may be possible to see these using a borescope or similar visual probe.
Other areas where the boiler scale has flaked off and the base metal are
  clearly visible on the borescope images.
Borescope inspections were routinely conducted after shutdown cycles.
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