1) Measuring instrument
Found on
https://www.crosswordclues.com/clue/profilograph
The profilograph is a device used to measure pavement surface roughness. In the early 20th century, Profilographs were low speed rolling devices. Today many Profilographs are advanced high speed systems with a laserbased height sensor in combination with an inertial system that creates a large scale reference plane. It is used by construction crew...
Found on
http://en.wikipedia.org/wiki/Profilograph
No exact match found.
