5) Turn the laser 180° towards wall B, and mark on the wall
the center of the cross lines as b1 (see figure 2).
A
180°
a1
X
6) Move the laser level towards wall B and position it
approximately 0.5 meter from wall B.
7) Mark on wall B the center of the cross lines as b2
(see figure 3).
A
a1
X
14
Figure # 2
Figure # 3
B
b1
X
B
b1
X
b2
X
0.5m