Kapro Prolaser 3D All-Lines 883G Manuel D'utilisation page 19

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) Unlock the pendulum, and press the button to project the
vertical forward beam (#4) towards the plumb line.
5) Turn the laser so that the vertical beam will merge with the
plumb line below the hanging point.
6) Mark point a2 on the wall, in the middle of the vertical beam
at the same height of a1. (see figure # 6).
a1
X
Figure # 5
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