Kapro Prolaser Vector 873 GREEN Manuel D'utilisation page 24

9) Rotate the laser clockwise so that the forward laser beam
passes through marks d1 on the table, and d2 on the wall D.
10) Mark the center of the side vertical beam at 2 locations.
Point a3 on the table near the point a1, and point a4
on the wall A near the point a2. (see figure 13).
d2 X
11) Measure the distances:
Δ1= from a1 to a3
Δ2= from a2 to a4
12) The difference Δ2 – Δ1 should not be more than 3 mm, otherwise
to send the laser level to a qualified technician for repair.
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D
d1
X
Figure # 13
A
a2 X
a1
X X
a3
X a4