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3) Mark point a1 on the wall, in the middle of the horizontal line at
the left edge of the horizontal beam (see figure 5).
5
# תמונה
4) Turn the laser level counterclockwise until the right edge of the
horizontal beam reaches near a1, mark a point a2 on the wall in
the middle of the horizontal beam (see figure 6).
18
a1
X
Figure # 5
Figure # 5
Figure # 6
Figure # 6
1.5m
a1
X
a2
X
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