18
6) Mark point
a2
on the wall, in the middle of the vertical
line at the same height as
a1
. (see figure 8).
7) The distance between
a1
and
a2
, should be no more
than 2mm, otherwise send the laser level to a
qualified technician for repair.
2 m
a1
a2
x
x
x
Figure # 8