In this paper, we present WAAT, an AR authoring tool dedicated to industrial environments. The interest of such a tool in an industrial context is to allow non-expert users to quickly create and dynamically modify 3D models of workstations, and also test the AR guidance placement. WAAT makes on-site authoring possible, which should really help to have an accurate 3D representation of assembly lines. The verification of AR guidance should also be very useful to make sure everything is visible and doesn't interfere with technical tasks. We deployed WAAT in an assembly line of an elm.leblanc/Bosch boiler factory to assess its features in an ecological context. We also made a comparison to another AR authoring tool to better estimate its advantages.