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4. Checking the 90°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 all vertical line beams.
3. Mark A near the center of the vertical line on the right wall, and mark B near the
center of the "90°vertical line" on the front wall.
Mark C near the center of the "180°vertical line" on the left wall.
C’
B
C
4. Turn the line laser by 90°keeping it in its original position, align the "right side vertical
line" with "B on the front," and mark C’ near the center of the "90°vertical line" on the
left wall.
5. The result is normal if the difference between C and C’ is within 1 mm.
