< 3 /16”
7,5m / 25 ft
< 6mm
1.
Checking plumblining
2.
3.
6.
Locate the position of the up beam
on the ceiling and make a mark.
Locate the position of the up beam on
the ceiling, which will be twice the
actual error, and make a mark.
Measure the difference between the two
marks on the ceiling, which will be twice
the actual error.
The difference may not be greater than:
6mm in 7.5 m (3/16“ in 25 ft),
5.
Rotate the laser 180° and realign the
down beam over the reference mark
on the floor.
4.
Place the laser so that its down beam
is over a reference mark on the floor.
Switch the unit on ( button 1)
1
The LA-4P four-point laser has been designed for building site use and leaves our
factory perfectly calibrated. As with any precision instrument, however, its calibra-
tion must be regularly checked. The unit should be checked before starting any
new tasks, particularly when the unit has been exposed to strong vibrations. After
an impact, the unit should be checked throughout its whole self-levelling range.
Checking the calibration
12
