Johnson Level & Tool Mfg. 40-6680 - Manual (Page 10)

10 ©2010 Johnson Level & Tool - Rev. 1
Self-Checking the 3 Horizontal Beams
1. As shown in Fig. 9.1, set up the instrument on the tripod or flat
platform 50 ft. (9.1m) from an upright wall. Aim the front beam at
the face of the wall. Mark the point projected on the wall by front
beam as A.
2. Turn the instrument
clockwise (Fig. 9.2) to
make the point projected
by right laser beam on
the same exact line as
point A, and then mark
the point as B.
3. Turn the instrument counterclockwise (Fig. 9.3) to make the point
projected by left laser beam on the same exact line as point A,
and then mark the point as C.
4. The vertical distance between points A, B and C should not exceed
0.125" (3.2mm).
5. If laser exceeds 1/8” at 50’, contact Johnson Level & Tool
for service.
Fig. 9.1 Fig. 9.2 Fig. 9.3
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