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2. Horizontal Line Accuracy
Check accuracy using two walls 20' apart.
1.
Set laser next to Wall A. Mark
beam height on Wall A as point A1.
(Figure 22)
2. Rotate laser 180°. Mark beam height
on Wall B as point C. (Figure 23)
3. Set laser next to Wall B and adjust
beam to height C. (Figure 24)
4. Rotate laser 180°. Mark beam height
on Wall A as A2. (Figure 25)
5. Measure the vertical distance between
A1 and A2. If this distance is <1/16" at
20', your horizontal accuracy is within
specification.
NOTE: If your laser needs non-warranty service or calibration, return
it to a Johnson authorized service center for repair.
20
Figure 22
Figure 23
Figure 24
Figure 25
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