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3) Set up the laser on a tripod or on a solid surface in front of the
wall, at a distance of approximately 2 meters.
4) Turn on the device and select the front vertical beam alone.
Project it on the plumb line.
5) Position the laser, so the vertical beam will intersect with the
plumb line below the hanging point.
6) Mark point a2 on the projected vertical line on the wall
at the same height as a1. (see figure # 6).
18
a1 x
Figure # 5
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