©2008 Johnson Level & Tool
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8. Self-Check and Calibration
IMPORTANT:
It is the responsibility of the user to verify the
calibration of the instrument before each use.
Accuracy Check
1. Put the laser on a tripod 50’ away from the wall. Put the laser
on the tripod with X+ axis towards wall.
2. Power on and after self-leveling, using the detector, make a
mark “A” on the wall where the detector indicates on grade with
the laser beam.
3. Turning the instrument 90º, Y+, X-, Y-, after the laser self-levels,
mark “B” for Y+, “C” for X- and “D” for Y- on the front wall. Make
sure points B, C, D are in the same vertical line as point A.
4. Measure the vertical distance between the highest and lowest
points between A, B, C, D and mark that “h”.
5. If “h” is less than 1/32”, the accuracy is good. If it is more than
1/32”, the accuracy is beyond its tolerance and the laser needs to
be recalibrated.
50’
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