Working Advice - Bosch GTL 3 Professional Manual Original

The measuring length 4 x 5 m = 20 m has a
maximum admissible deviation of:
20 m x ±0.4 mm/m* = ±8 mm.
Therefore, the maximum difference d between
the points I and VII may be 8 mm or less.
* The value ±0.4 mm/m results from the an-
gle accuracy ±0.2 mm/m plus a possible un-
certainty of 0.2 mm/m while turning.

Working Advice

Always position the measuring tool flat
on the floor or fix it flat on the wall. In
case of uneven positioning or fixing, the
angle is smaller than 45° and 90°.
Always use the centre of the laser line
for marking. The width of the laser line
changes with the distance.
Never use the laser lines that the meas-
uring tool standing on the floor projects
on the wall for alignment. The measuring
tool is not self-levelling. Therefore, the
line on the wall is distorted.
The reference point for the alignment of
tiles is the crossing point P of the laser
lines directly in front of the measuring
tool. In order to mark an angle, the meas-
uring tool has to be turned at this cross-
ing point, see figure F.
Position the measuring tool only on a
clean levelling plate 10. The measuring
tool cannot stand level on an uneven,
soiled levelling plate surface, which could
lead to faulty measuring results.
Bosch Power Tools
Working with the levelling plate
(see figures D–E)
Using the levelling plate 10 you can position
the measuring tool flat on an uneven or un-
stable floor.
The levelling plate 10 can also be used as a
wall bracket for the measuring tool. Fix the
levelling plate (securing it against slipping)
on a wall or an inclined surface using e.g.
standard screws. Use a level to fix the level-
ling plate flat on the surface.
Positioning of the measuring tool on the
levelling plate: Position the measuring tool
with the magnets 4 on the underside on the
levelling plate 10. The line grid on the upper
side of the levelling plate facilitates the pre-
cise positioning of the measuring tool. In or-
der to mark 90° or 45° angles, position the
levelling plate at a reference edge or a pro-
jection on a wall and position the measuring
tool as illustrated on the upper side of the
levelling plate.
Working with the laser target plate/ceiling
measurement plate (see figure A)
The laser target plate 9 or the ceiling meas-
urement plate 14 improves the visibility of
the laser beam under unfavourable condi-
tions and at longer distances.
The reflective part of the laser target plate 9
improves the visibility of the laser line. Thanks
to the transparent part, the laser line is also
visible from the back side of the laser target
plate.
The ceiling measurement plate 14 (accessory)
can also be used for marking the laser lines.
Like the laser target plate, it has a reflective
and a transparent part.
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1 609 929 S09 | (15.10.08)