©2017 Johnson Level & Tool - Rev. 1 25
the more accurate the check will be. We recommend a
minimum height of 10’; 25’ is preferred.
3. Mark the point on the ceiling where the plumb beam hits.
4. Rotate the laser 90 degrees and again mark the spot where
the plumb beam hits.
5. Repeat step 4 twice, resulting in a total of 4 marks on the ceiling.
6. The four points should form a circle. Measure its diameter. If
this diameter is less than 3/16” at 25’, the laser is in
calibration. If the plumb beam is out of calibration, and the
rotary beam is within calibration, the laser must be serviced
by an authorized Johnson dealer. No further user adjustments
are possible. If both rotary and plumb beams are out of
calibration, follow the steps above for Accuracy Calibration.
Vial Calibration
1. Adjust the laser so that it projects a perfectly vertical beam on
the wall. Mark two points on the wall and use a known cali-
brated bubble level to validate that beam is vertical. If the vial
on the laser reads level, no further adjustments are needed.
2. If the vial needs adjustment, use a screwdriver to remove the
vial level adjustment bolt cover.
3. Insert a 2.5mm hex wrench into the adjustment hole to adjust
the screw.
1658i-English_Manuals 1/11/17 11:50 AM Page 25
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