Tool for Determining Verticality
This page is the CodyCross answer for the clue below from Prehistory, Group 1254, Puzzle 2 (Social Development).
Question is: Tool for Determining Verticality
and the answer is: PLUMBLINE
Word Meaning:
PLUMB LINE — A cord with a weight attached, used to produce a vertical line; a plummet.
Definitions from Wiktionary.