Auto Collimeter

Auto collimator is a sensitive, extremely accurate optical instrument which is precisely used in optical workshops, inspection departments and quality control labs. It is basically a comparator where we compare optical element like slabs and prisms for flatness. It is used for very small angle measurements of the order of minutes.
Specifications : -

main drum division = 2 second
division on reticle = 1 minute
fl of objective = 220mm
clear aperture = 40mm
magnification = 11x
least division on = 2" of arc micrometer drum
built in light source ,with 3 levelling screws in the base and suitable for measuring small angles widely used in metrological labs. It work on the principle light fall normally on mirror, the reflected ray comes back along the same path as the incident.