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©2017 Johnson Level & Tool - Rev. 1
11. Calibration
IMPORTANT:
It is the responsibility of the user to verify the
calibration of the instrument before each use.
X- and Y-Direction Accuracy Verification
1. Note X- and Y-direction as indicated on the top of the laser.
2. In an indoor setting, place the laser on a level platform at least
25’ away from a wall. Position the laser so the X-direction is
facing the wall.
3. Press the button to power on the laser.
4. Set the lock knob to the “On” position to unlock it.
5. Press the button to change the rotating speed to Low.
6. Mark any point along the top edge of the beam where the
beam hits the wall as Point Ax. (Note: This test should be done
indoors with dim lighting. It is critical that the laser mark is
easily seen.)
7. Rotate the laser 180 degrees.
8. Mark a point where the top edge of the beam hits the wall as
Point Bx. This point should be in the same vertical plane as
point Ax (directly above, below, or on top of point Ax).
9. Mark the center point between points A and Bx as Point 0x.
10.If the distance between point Ax and Point Bx is more than
3/16” at 25’, the laser is out of calibration. Calibrate the laser
by following the steps in the Accuracy Calibration section
below. If this distance is < 1/16” at 25’, proceed to step 11 to
check the Y-direction accuracy.
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