25
14) Mark point
a2
on wall
A
, in the middle of the side vertical
beam, near point
a1
and at the same height.
(see figure #13).
15) Measure the distances:
Δ = from
a1
to
a2
16) The difference Δ from
a1
to
a2
should be no more than 3 mm,
if otherwise, send the laser level to a qualified technician for
repair.
17) Repeat the same procedure (1 – 16) to check the perpendicularity
between the other 2 vertical beams.
# הנומת
13
Figure # 13
A
D
X
d1
a1 Xa2
X
X
Figure # 13
