Johnson Level & Tool Mfg. 40-6625 - Manual (Page 10)

10 ©2010 Johnson Level & Tool - Rev. 2
8. Self-Check & Fine Calibration
IMPORTANT: It is the responsibility of the user to verify the
calibration of the instrument before each use.
1. Set the instrument on a level flat head tripod centered
between two walls (marked 1 & 2) approximately 15 feet
apart. (See fig. 1).
2. Point the instrument directly at wall 1. Turn the laser on and
mark the intersection of the beams as point A.
3. Turn the instrument 180 degrees so that the laser is pointed
directly at wall 2. Turn the laser and mark the intersection of
the beams as point B.
4. Move the instrument and the tripod so the laser is positioned
approximately 2 feet away from wall 1 (see fig. 2). Level the tri-
pod and position the instrument on the tripod facing wall 1. Turn
the laser on and mark the intersection of the beams as point C.
5. Turn the laser off and rotate the laser 180 degrees so that it is
facing directly to wall 2.
6. Turn on the laser and mark the
intersection of the beams as point D.
7. Measure the distance between
points A & C.
8. Measure the distance between
points B & D.
9. If the difference between points
A & C and points B & D are less
than 1/16”, your instrument is within
its tolerance.
Wall 1 Wall 2
Fig 1
Fig 2
3728H_Manuals 9/2/10 8:02 AM Page 10