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3. Checking the 180°vertical line
B
C
A
1. Make a mark on the floor near the center of a room with 4 to 6 m walls.
2. Emit the vertical line beam.
3. Mark A near the center of the vertical laser line on the right wall, and mark B near the
center of the "90°vertical laser line" on the front wall.
Mark C near the center of the "180°vertical laser line" on the left wall.
C
B
D
A
4. Turn the line laser by 180°keeping it in its original position, align the "right side
vertical line" with point C on the left wall, and mark D near the center of the "left side
vertical line" on the right wall.
5. The result is normal if the difference between points A and D is within 1 mm.
