Kapro Prolaser Vector 873 Manuel D'utilisation page 18

5) The distance between a1 and a2, should not be more than
1 mm, otherwise to send the laser level to a qualified
technician for repairs.
3. Checking the Accuracy of the Vertical beam.
1) Hang approximately 4 meter plumb line on a wall.
2) After the plumb line has settled, Mark point a1 on the wall
behind the plumb line near the plumb cone. (see figure 7).
3) Set up the laser on a tripod or on a solid surface in front of the
wall at a distance of approximately 2 meters.
4) Unlock the pendulum, and press the button to project the
vertical beam towards the plumb line.
5) Turn the laser so that the vertical beam will merge with the
plumb line below the hanging point.
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a1
X
Figure # 7