15
Point Laser Levels
Plumb Accuracy
Plumb Accuracy
To check the accuracy of the plumb:
1. Find a site that has a known vertical height X. Put unit on oor stand and place on the oor.
2. Place a cross mark at the bottom of the site.
1
3. Center the down laser on both axes of the cross mark. See Figure 7.
X
2 3
1
1 2 3
2 3
= V
d
Figure 7. Plumb Accuracy
4. Place a cross mark at the point where the up point laser intersects the target area at the top of the site.
2
5. Turn the Product 180 ° on its center.
1
6. Recenter the down point laser on Mark 1 and mark where the up point laser intersects the target area at the top site.
3
7. The distance measured between
2
and
3
is equal to Vd. Divide Vd by two to calculate the dierence of error.
Compare your measurement to column Y in the table below @ the corresponding X ceiling height. See Table 5.
Table 5.
V
d
2
≤ Y @ X
Y @ X
in. mm ft. m
1/32 0.75 7.5 2.29
1/24 1.0 10.0 3.05
1/16 1.5 15.0 4.57
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