Nikon's line of autocollimators provide the exceptional accuracy and reliability required for demanding measurements such as checking parallelism of end surfaces, squareness, flatness of surface plates, straightness of movement and calibration of rotary tables and dividing heads.

Nikon's 6B autocollimator checks alignment and measures very small angular deviations to measure flatness or height by simple geometry. The 6B brightfield model projects a dark cross and illuminates the surface so you can see details

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.