Locating and tracing tool

摘要

A tool of the invention comprises a casing having two mutually perpendicular elongate plane bearing faces extending in two longitudinal directions. A first laser beam generator generates a laser line in the first longitudinal direction. Air levels are used to check that a bearing face is horizontal. Retractable linear marking means such as a tracing cord or a graduated tape can be deployed in the second longitudinal direction, thereby extending the second bearing face, and retracted into the casing by winding them onto a spool provided with a handle. This kind of tool considerably facilitates marking and tracing lines on a construction site and constitutes an easily transportable one-piece object.