This is a ruler 50 feet long, for accurate measuring horizontally in Surveyor. It is a kind fixed track so multiple rulers can be attached to each other to make a longer ruler.
You can rotate the ruler or multiple joined rulers and change the height but if other copies of the ruler are attached, the height of each attached ruler must be adjusted separately. This is useful where the ground slopes, and the joined rulers can be stepped (different heights).
Use Alt fly in 2004 or Alt u in 2006 to move in closer to read the ruler.
I hope you find it useful.
Installs as Ruler 100 metres in the Australia scenery listing.