Kapro Prolaser 3D All-Lines 883G Manuel D'utilisation page 16

8) Without turning the laser level. Lock the pendulum and move
the laser level towards the wall B and position it approximately
0.5 meter from the wall B.
9) Unlock the pendulum and press the Beam Selector (a),twice
to project all 3 lasers beams.
10) Verify that the vertical line pass through a1, and b1.
11) Mark on wall B the center of the cross beams as b2
(see figure# 3).
A
a1
X
12) Turn the laser 180°. Reposition the laser and verify that the
2 vertical lines pass through b2, and a1.
13) Mark on wall A the center of the cross beams as a2
(see figure # 4).
16
C
Figure # 3
2m
B
b1
X
b2
X
0.5m