Working Advice - Bosch GLL 3-15 Operating Instructions Manual

In this case, bring the tool to the level position
and wait for the self-leveling to take place. As
soon as the tool is within the self-leveling range
of ±4°, the laser lines light up continuously.
The leveling indicator 2 lights up green and the
audio signal turns off.
When not within the self-leveling range of ±4°,
working with automatic leveling is not possible,
because it cannot be assured that the laser
lines run at a right angle to each other or are
level.
In case of ground vibrations or position changes
during operation, the tool is automatically
leveled in again. To avoid errors, check the
position of the horizontal and vertical laser
Always use the center of the laser line for
marking. The width of the laser line changes
with the distance.
Attaching with the Positioning Device
To fasten the tool on the positioning device 9,
screw the locking screw 10 of the positioning
device into the 1/4" tripod mount 5 on the tool
and tighten. To swivel the measuring tool on
the positioning device, move along the turning
disc 11.
With the positioning device 9, the tool can be
attached as follows:
– The positioning device 9 can be fastened to
steel parts via the magnets 14.
– The positioning device 9 can be fastened to
drywalls or wood walls with screws. For
this, insert screws with a minimum length of
2" into the screw holes 16 of the positioning
device as shown in figure K.
– Mount the positioning device 9 on floor by
extending the retractable fee 15 as shown in
figure L.
– The positioning device 9 can also be
attached to ceiling grid channels in the walls
using the clip 13 as shown in figure N. The
fine adjustment knob 12 can be turned to
move the horizontal line up and down to align
with benchmark.
Working with Optional Tripod
(Accessory)
A tripod 18 offers a stable, height-adjustable
measuring support. Place the tool via the tripod
mount 5 onto the 1/4-20 male thread of the
tripod and screw the locking screw of the tripod
tight.
line with regard to the benchmark points upon
re-leveling.
Working without Automatic Leveling
For work without automatic leveling, push the
switch for automatic leveling 4 to the
The automatic leveling indicator 2 lights up red
( symbol/"red").
When the automatic leveling is switched off,
the tool can be held by hand or placed on an
inclined surface. The laser lines no longer
necessarily run level.

Working Advice

Working with the Measuring Plate
With the measuring target plate 19, it is possible
to project the laser mark onto the floor or the
laser height onto a wall.
With the zero field and the scale, the offset or
drop to the required height can be measured
and projected at another location. This
eliminates the necessity of precisely adjusting
the tool to the height to
be projected.
The measuring target plate 19 has a reflective
coating that enhances the visibility of the laser
beam at greater distances or in intense sunlight.
The brightness intensification can be seen only
when viewing, parallel to the laser beam, onto
the measuring plate.
Laser Viewing Glasses (Accessory)
The laser viewing glasses 17, filter out the
ambient light. This makes the red light of the
laser appear brighter for the eyes.
• Do not use the laser viewing glasses as
safety goggles. The laser viewing glasses
are used for improved visualization of the
laser beam, but they do not protect against
laser radiation.
• Do not use the laser viewing glasses as
sun glasses or in traffic. The laser
viewing glasses do not afford complete UV
protection and reduce colour perception.
-10-
(Accessory)
position.