Johnson Level & Tool Mfg. 40-6662 - Manual (Page 13)

©2011 Johnson Level & Tool - Rev. 1 13
8. Self-Check & Fine Calibration
IMPORTANT: It is the responsibility of the user to verify the
calibration of the instrument before each use.
Horizontal Line for Level
1. Set the laser unit on a tripod or flat surface approximately 10’ away
from a reference wall.
2. Unlock the transportation lock on the unit.
3. Press the horizontal laser line button (H) and the vertical laser line button (V1).
4. Point the cross line at the reference wall (It is important to see the
laser line very clearly. This test should be preformed indoors and
in low light conditions).
5. Mark the intersection of the cross line as point A.
6. Rotate the laser unit counter clockwise until the laser cross line is 8 feet away
from point A (to the left of point A). Mark the laser line at point A as point B.
7. Rotate the laser unit clockwise until the cross line is 8 feet to the right of point A.
8. Mark the laser line a point A as point C.
9. If the distance between point B & C is greater then 1/16” the unit needs
to be recalibrated. (See calibration information).
3 Vertical Lines for Plumb
1. Use a plumb line or known vertical reference point.
2. Turn the laser unit on following the instructions above.
3. Rotate the laser unit so the vertical laser line intersects the plumb line.
4. Check all three vertical lines.
5. If the vertical laser line is not parallel with the plumb line (i.e. intersects
at the top and bottom), the unit needs to be recalibrated. (See
calibration information).
4386H-English_Manuals 2/24/11 3:04 PM Page 13