Railroad land surveying crew with their equipment.
The rod they're using is marked in units of studs, the preferred LEGO unit of length!
They're using a total station to measure distance and height at the same time. The red dish is attached to the steering wheel base with a broken hinged bar. Don't worry, I didn't break it on purpose! It broke by accident while I was working on my forklift.
I put them to work on the train station project in my town to lay out the foundation.