Well I looked at that sight and the one I have is a little different. It is a small box like thing. about 2 1/2 inches high and 1 1/4 inches wide and 1 1/4 inch deep. The pedulum hangs on the only spot it can and it hangs pretty true that i can see. It seems to work ok.I have to get another battery fer the bulb to light up. The one I got is getting close to dead. On the front side of it, it has 3 horizontal for distantance to mark with i guess, and 1 vertical for left n right adjustment. I'll see if I can take a picture later on for ya to see it. Do you know of any sights like that ..name.... thx