Laser Levels
Check Product Accuracy
15
Vertical Laser Accuracy
To check the accuracy of the vertical laser:
1. Find a door jamb that has ∼2.29 m (7.5 ft) clearance on both sides of the door.
2. Put a center mark on the door header an equal distance from both sides of the door jamb.
3. Put a cross mark (mark 1) on the floor centered on the mark on the door header. See Figure 9.
4. Put a second cross mark (mark 2) ∼2.29 m (7.5 ft) from mark 1. Use the vertical laser to make sure that
mark 2 is centered on the door header and intersects mark 1.
5. Put the Product on mark 2 with the vertical laser on.
6. Put a third cross mark (mark 3) on the floor ∼4.57 m (15 ft) from the Product. Use the vertical laser to make
sure that mark 3 is centered on the door header and intersects mark 1.
7. Put a cross mark on the door header above mark 1.
8. Move the Product to mark 3 and align the laser so that it intersects the centers of marks 1 and 2.
9. Put another cross mark on the door header above mark 1.
10. Measure the distance between the center points of the two cross marks.
If the distance is ≤3 mm at 10 m (1/8 in at 30 ft), the laser is within calibration accuracy.
Figure 9. Vertical Laser Accuracy
1
3
2.29 m
(7.5 ft)
4.57 m
(15 ft)
1
2
2
123
1 2
= V
d
3 mm @ 10 m
(1/8 in @ 30 ft)
= OK
V
d
x 2
≤
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