What is this device?

Does anyone have an idea of what this is?
Sorry for the poor photos.
It is about 4 1/2 to 5 foot tall. It is fairly heavy, my guess is over 20 lbs.
There are 2 vertical metal columns. Near the top are two red painted metal rectangular blocks, that can slide up/down the columns with locking bolts. At the center of each red block is a vertical hole with a cylindrical bushing holding a thin cable running vertically through and down to the tri-legged base. The cable is the same as what you’d find on bicycle caliper brakes. There is another rectangular red block just above the 3 legged base. Each of the 3 legs at the base has a threaded adjustable spike for leveling.
The second photo shows a closer view of the red blocks. One has a metal platform which holds a bubble level and a round dial marked 0, 10, 20, 30, etc to 90 with 10 divisions between each.

I will try to post the second photo in the following post. The site won’t let me imbed more than one photo.

Here is the second photo showing detail of the upper two blocks: