The Green Laser and Its Mount

It is important to use a green laser rather than the more common red laser. This is so because the human eye is much more  sensitive to green  light  than red. A red laser would simply not be visible in the sky during polar alignment. 

Shown here is the green laser in its mount made from white, 3/4-inch PVC pipe. Threaded into each end of the mount are 3 nylon screws for adjusting the aim of the laser. The middle screw on top activates the laser push-button switch.