Nikon’s 6B autocollimator checks alignment and measures very small angular deviations to measure flatness or height by simple geometry. The 6D darkfield
model projects a bright crossline and is the most popular model because
the bright-line cross is the easiest to see. Provides measuring
accuracy down to 0.5 arc seconds.

Readings of angular displacement of 0.5 second of arc using an easy-to-read large-diameter micrometer drum.

The 6D employs a 70mm aperture lens to product clear, reflected images.
It also features extremely accurate double line reticles for improved
detection.

The 6D Autocollimator makes high-precision measurements simultaneously
on two axes with the darkfield technique. It projects a bright crossline
and Nikon’s most popular model because the bright-line cross is the
easiest to see.

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