Kapro Prolaser Multi Beam Manuel D'utilisation page 19

4. Turn the laser level counterclockwise until the cross-
section of the beams moves approximately 90°, mark
a point a2 on the wall near a1 in the middle of the
horizontal beam (see figure 6).
5. The distance between a1 and a2, should be no more
than 1.5 mm, if otherwise send the laser level to a
qualified technician for repair.
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