I made it at Techshop. http://www.techshop.ws/
This is my version of an Equal-Arm Beam Balance Micro Scale. It is 24 inches long, 2 ¾ inches wide and 8¼ high.
I wanted a stable foundation to use and mount the hardware to. I looked at several materials and came upon this aluminum I-beam level.
I removed the center bubble holder and tube.
Then I flipped (reversed direction) one of the bubble mounts to use as the Y axis leveling, leaving the other end for the X axis leveling.