Kapro Prolaser 3D All-Lines 883G Manuel D'utilisation page 21

5. Checking 90º accuracy between the 2 Vertical beams.
This procedure requires a room of at least 5x5 meters with 3
walls.
1) Set up the laser on a table or on the floor in the middle of the
room.
2) Unlock the pendulum and press the button Beam Selector (a),
twice to project the forward and the side vertical beams
3) Mark the center of the side vertical beam in 3 places;
• Point a1 on the left wall A, in the middle of the vertical line.
• Point b1 on the right wall B, in the middle of the vertical line.
• Point c1 on the table, in the middle of the cross lines of the
2 verticals.
4) Mark the point c2 on the front wall C, in the middle of the
vertical line (see figure # 7).
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