Sighting Collimator Unit

The two sighting collimator units, for collimating the target at the beginning step, are fixed on both sides of the EDM cover (coplanar to EDM axis). On the side of the object lens, there will be plane glass of “+” or “△” type; while on the other side (the side of eyepiece), there will be a magnifier through which “△”or “+” can be seen distinctly. Sighting collimator unit and the EDM axis must be coaxal.