Cooper Hand Tools LUFKIN LCL4 - Manual (Page 13)

Page 13
x x
A2 B2
4-5m
15cm
Surface 1 Surface 2
Figure 2
CALIBRATION
To check plumb:
Choose a door jamb
with a minimum of 2.5
metres clearance on
each side of the door.
Turn on the LCL4 to “auto level” setting.
With your laser at point “A” (figure 3),
make two marks on the floor.
Make the first mark at 2.5 metres from
point “A” centred on the door header
above. Mark this point “B”.
Make a second mark 5 metres from point “A”. Make this point “C”.
Without moving the laser, make a third mark on the door header. Make this point “D”.
Now move the laser to point “C”. EXACTLY align the beam with point “B”. Notice where the
beam falls at point “D”. If it is within 4mm of point “D”.
The laser is in calibration.
A B
C
D
Figure 3