Kapro Prolaser 852G Manuel D'utilisation page 18

5) The distance between a1 and a2, should not be more than
1.5mm otherwise to send the laser level to a qualified
technician for repairs.
Checking the Accuracy of the Vertical line.
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 line toward the plumb line.
5) Turn the laser so that the vertical line will merge with the
plumb line below the hanging point.
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a1 x
Figure # 7