PARTY.  Caution – The use of other operating or adjusting

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Bosch Power Tools
Keep the measuring tool, the laser target 
plate 21 and the holder 10 away from cardi-
ac pacemakers. The magnets inside the 
measuring tool, the laser target plate and the 
holder generate a field that can impair the 
function of cardiac pacemakers.
 Keep the measuring tool, the laser target plate 21 and 
the holder 10 away from magnetic data carriers and 
magnetically sensitive devices. The effect of the mag-
nets inside the measuring tool, the laser target plate and 
the holder can lead to irreversible data loss.
Product Description and Specifica-
tions
Please unfold the fold-out page with the representation of the 
measuring tool and leave it unfolded while reading the operat-
ing instructions.
Intended Use
The measuring tool is intended for determining and checking 
horizontal and vertical lines.
Technical Data
Product Features
The numbering of the product features shown refers to the 
illustration of the measuring tool on the graphic page.
1 Exit opening for laser beam
2 Tripod mount 1/4"
3 On/Off switch
4 Operating mode button
5 Automatic levelling indicator
6 Laser warning label
7 Serial number
8 Latch of battery lid
9 Battery lid
10 Holder
11 Locking screw for holder
12 Screw holes of holder
13 Opening for strap attachment
14 Magnets
15 1/4" tripod mount on holder
16 5/8" tripod mount on holder
17 Protective pouch
18 Tripod*
19 Laser viewing glasses*
20 Magnets laser target plate
21 Laser target plate*
22 Measuring plate with stand
23 Universal holder BM 1*
24 Telescopic rod*
* The accessories illustrated or described are not included as 
standard delivery.
Assembly
Inserting/Replacing the Batteries
Alkali-manganese batteries are recommended for the meas-
uring tool.
To open the battery lid 9, press the latch of the battery lid 8 in 
the direction of the arrow and remove the battery lid. Insert 
the supplied batteries. When inserting, pay attention to the 
correct polarity according to the representation on the inside 
of the battery compartment.
When the batteries become weak, the laser beams flash rap-
idly for about 5 s (while the measuring tool is switched on).
Always replace all batteries at the same time. Only use batter-
ies from one brand and with the identical capacity.
 Remove the batteries from the measuring tool when 
not using it for extended periods. When storing for ex-
tended periods, the batteries can corrode and self-dis-
charge.
Cross-line Laser
GLL 2-15
Article number
3 601 K63 7..
Working range, min.
 1)
15 m
Levelling Accuracy
±0.3 mm/m
Self-levelling range, typically
±4°
Levelling duration, typically
<4 s
Operating temperature
–10 °C ... +50 °C
Storage temperature
–20 °C ... +70 °C
Relative air humidity, max.
90 %
Laser class
2
Laser type
635 nm, <1 mW
C
6
1
Tripod mount
– Cross-line Laser
– Holder
1/4"
1/4"; 5/8"
Batteries
3 x 1.5 V LR06 (AA)
Operating time, approx.
15 h
Automatic switch-off after approx.
120 min
Weight according to 
EPTA-Procedure 01/2003
0.3 kg
Dimensions
80 x 42 x 96 mm
Degree of protection
IP 5X (dust protected)
1) The working range can be decreased by unfavourable environmental 
conditions (e.g. direct sun irradiation).
The measuring tool can be clearly identified with the serial number 7 on 
the type plate.
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Bosch Power Tools
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Operation
Initial Operation
 Protect the measuring tool against moisture and direct 
sun light.
 Do not subject the measuring tool to extreme tempera-
tures or variations in temperature. As an example, do 
not leave it in vehicles for a long time. In case of large vari-
ations in temperature, allow the measuring tool to adjust to 
the ambient temperature before putting it into operation. 
In case of extreme temperatures or variations in tempera-
ture, the accuracy of the measuring tool can be impaired.
 Avoid heavy impact or falling of the measuring tool. Af-
ter heavy exterior impact on the measuring tool, an accura-
cy check should always be carried out before continuing to 
work (see “Levelling Accuracy”).
 Switch the measuring tool off during transport. When 
switching off, the levelling unit, which can be damaged in 
case of intense movement, is locked.
Switching On and Off
To switch on the measuring tool, push the On/Off switch 3 to 
the “On” position. Immediately after switching on, the meas-
uring tool sends two laser beams out of the exit opening 1.
 Do not point the laser beam at persons or animals and 
do not look into the laser beam yourself, not even from 
a large distance.
To switch off the measuring tool, slide the On/Off switch 3 to 
the “Off” position. When switching off, the levelling unit is 
locked.
Deactivating the Automatic Shut-off
The measuring tool switches off automatically after an operat-
ing duration of 120 minutes. To deactivate the automatic 
switch-off, keep the operating mode button 4 pressed for 3 s 
while switching on the measuring tool. When the automatic 
switch-off is deactivated, the laser lines briefly flash after 3 s.
 Do not leave the switched-on measuring tool unattend-
ed and switch the measuring tool off after use. Other 
persons could be blinded by the laser beam.
To activate the automatic shut-off, switch the measuring tool 
off and then on again (without the operating mode button 4 
pushed).
Operation Modes (see figures A –C)
The measuring tool has four operating modes between which 
you can switch at any time:
– Horizontal operation “–” (with automatic levelling): 
Produces a horizontal laser line,
– Vertical operation “l” (with automatic levelling): 
Produces a vertical laser line,
– Cross-line operation “+” (with automatic levelling): 
Produces a horizontal and vertical laser line,
– Cross-line operation “+” (without automatic levelling): 
Produces a horizontal and vertical laser line.
Once the measuring tool has been switched on, it is in cross-
line operation with automatic levelling. To change the operat-
ing mode, press the operating mode button 4.
If the automatic levelling indicator 5 lights up, the measuring 
tool is in the operating mode without automatic levelling. In 
this operating mode the respective laser lines are permanent-
ly displayed, regardless of the inclination of the measuring 
tool.
Working with Automatic Levelling
Position the measuring tool on a level and firm support, attach 
it to the holder 10 or to the tripod 18.
After switching on, the levelling function automatically com-
pensates irregularities within the self-levelling range of ±4°. 
The levelling is finished as soon as the laser beams do not 
move any more.
If the automatic levelling function is not possible, e.g. be-
cause the surface on which the measuring tool stands devi-
ates by more than 4° from the horizontal plane, the laser 
beams flash slowly. In this case, bring the measuring tool to 
the level position and wait for the self-levelling to take place. 
As soon as the measuring tool is within the self-levelling range 
of ±4°, the laser lines light up continuously again.
In case of ground vibrations or position changes during opera-
tion, the measuring tool is automatically levelled in again. To 
avoid errors, check the position of the horizontal and vertical la-
ser line with regard to the reference points upon re-levelling.
Levelling Accuracy
Influences on Accuracy
The ambient temperature has the greatest influence. Espe-
cially temperature differences occurring from the ground 
upward can divert the laser beam.
As thermal fluctuation is largest close to the ground, the 
measuring tool, if possible, should be mounted on a commer-
cially available tripod and placed in the centre of the working 
area.
Apart from exterior influences, device-specific influences 
(such as heavy impact or falling down) can lead to deviations. 
Therefore, check the accuracy of the measuring tool each 
time before starting your work.
First, check both the height as well as the levelling accuracy of 
the horizontal laser line, then the levelling accuracy of the ver-
tical laser line.
Should the measuring tool exceed the maximum deviation 
during one of the tests, please have it repaired by a Bosch 
after-sales service.
Checking the Height Accuracy of the Horizontal Line
For this check, a free measuring distance of 5 m on a firm 
surface between two walls A and B is required.
– Mount the measuring tool onto the holder or a tripod, or 
place it on a firm and level surface close to wall A. Switch 
the measuring tool on.
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Bosch Power Tools
– Direct the laser against the close wall A and allow the meas-
uring tool to level in. Mark the centre of the point where the 
laser lines cross each other on the wall (point
I).
– Turn the measuring tool by 180°, allow it to level in and 
mark the cross point of the laser lines on the opposite wall 
B (point
II).
– Without turning the measuring tool, position it close to wall 
B. Switch the measuring tool on and allow it to level in.
– Align the height of the measuring tool (using a tripod or by 
underlaying, if required) in such a manner that the cross 
point of the laser lines is projected against the previously 
marked point
II on the wall B.
– Without changing the height, turn around the measuring 
tool by 180°. Direct it against the wall A in such a manner 
that the vertical laser line runs through the already marked 
point
I. Allow the measuring tool to level in and mark the 
cross point of the laser lines on the wall A (point
III).
– The difference d of both marked points
I and III on wall A 
indicates the actual height deviation of the measuring tool.
The maximum permitted deviation d
max
 is calculated as 
follows:
d
max
= double distance of the walls x 0.3 mm/m
Example: With a 5 metre distance between the walls, the max-
imum deviation must not exceed 
d
max
= 2 x 5 m x 0.3 mm/m = 3 mm. Thus, the marks must not 
be more than 3 mm apart.
Checking the Levelling Accuracy of the Horizontal Line
For the check, a free surface of approx. 5 x 5 metres is 
required.
– Mount the measuring tool between both walls A and B onto 
the holder or a tripod, or place it on a firm and level 
surface. Allow the measuring tool to level in.
– At a distance of 2.5 metres from the measuring tool, mark 
the centre of the laser line (point
I on wall A and point II on 
wall B) on both walls.
– Set up the measuring tool 5 metres away turned by 180° 
and allow it to level in. 
– Align the height of the measuring tool (using a tripod or by 
underlaying, if required) in such a manner that the centre 
of the laser line is projected exactly against the previously 
marked point 
II on wall B.
A
B
5 m
A
B
180°
A
B
d
180°
A
B
2,5 m
5,0 m
A
B
2,5 m
d
5,0 m
2,5 m
2,5 m
5,0 m
0 m
A
B
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Bosch Power Tools
1 609 92A 0KH | (28.4.14)
– Mark the centre of the laser line as point 
III (vertically 
above or below point 
I) on the wall A.
– The difference d of both marked points 
I and III on wall A 
indicates the actual deviation of the measuring tool from 
the level plane.
The maximum permitted deviation d
max
 is calculated as 
follows:
d
max
= double distance of the walls x 0.3 mm/m
Example: With a 5 metre distance between the walls, the max-
imum deviation must not exceed
d
max
= 2 x 5 m x 0.3 mm/m = 3 mm.  Thus,  the  marks  must  not 
be more than 3 mm apart.
Checking the Levelling Accuracy of the Vertical Line
For this check, a door opening is required with at least 2.5 m 
of space (on a firm surface) to each side of the door.
– Position the measuring tool on a firm, level surface (not on 
a tripod) 2.5 m away from the door opening. Direct the la-
ser beams at the door opening and allow the measuring 
tool to level in.
– Mark the centre of the vertical laser line at the floor of the 
door opening (point
I), at a distance of 5 m beyond the 
other side of the door opening (point
II) and at the upper 
edge of the door opening (point
III).
– Position the measuring tool on the other side of the door 
opening directly behind point 
II. Allow the measuring tool 
to level in and align the vertical laser line in such a manner 
that its centre runs exactly through points 
I and II.
– The  difference  d between point 
III and the centre of the la-
ser line at the upper edge of the door opening results in the 
actual deviation of the measuring tool from the vertical 
plane.
– Measure the height of the door opening.
The maximum permitted deviation d
max
 is calculated as 
follows:
d
max
= double height of the door opening  x 0.3 mm/m
Example: With a door opening height of 2 metres, the maxi-
mum permitted deviation is d
max
= 2 x 2 m x 0.3 mm/m
= 1.2 mm. Thus, the marks must not be more than 1.2 mm 
apart.
Working Advice
 Always use the centre of the laser line for marking. The 
width of the laser line changes with the distance.
Attaching with the Holder
To fasten the measuring tool on the holder 10, screw the lock-
ing screw 11 of the holder into the 1/4" tripod mount 2 on the 
measuring tool and tighten. To rotate the measuring tool on 
the holder, slightly loosen the screw 11.
With the holder 10, the measuring tool can be attached as 
follows:
– Mount the holder 10 to the tripod 18 or a commercially 
available camera tripod via the 1/4" tripod mount 15. For 
fastening to a commercially available construction tripod, 
use the 5/8" tripod mount 16.
– The holder 10 can be fastened to steel parts via the 
magnets 14.
– The holder 10 can be fastened to drywalls or wood walls 
with screws. For this, insert screws with a minimum length 
of 50 mm into the screw holes 12 of the holder.
– The holder 10 can also be fastened to pipes or similar 
beams using a commercially available strap by threading it 
through the opening 13 for strap attachment.
Working with the Tripod (Accessory)
A tripod offers a stable, height-adjustable measuring support. 
Place the measuring tool via the tripod mount 2 onto the 1/4" 
male thread of the tripod and screw the locking screw of the 
tripod tight.
Working with the Measuring Plate (Accessory) 
(see figures G–H)
With the measuring plate 22, 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 measuring tool to the height to be projected.
The measuring plate 22 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 meas-
uring plate.
2,5 m
2,5 m
2,5 m
2,5 m
2,5 m
2,5 m
d
2 m
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Bosch Power Tools
Laser Viewing Glasses (Accessory)
The laser viewing glasses 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 visualisa-
tion 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.
Work Examples (see figures D –F)
Applicational examples for the measuring tool can be found 
on the graphics pages.
Maintenance and Service
Maintenance and Cleaning
Store and transport the measuring tool only in the supplied 
protective pouch.
Keep the measuring tool clean at all times.
Do not immerse the measuring tool in water or other fluids.
Wipe off debris using a moist and soft cloth. Do not use any 
cleaning agents or solvents.
Regularly clean the surfaces at the exit opening of the laser in 
particular, and pay attention to any fluff or fibres.
In case of repairs, send in the measuring tool packed in its 
protective pouch 17.
After-sales Service and Application Service
Our after-sales service responds to your questions concern-
ing maintenance and repair of your product as well as spare 
parts. Exploded views and information on spare parts can 
also be found under:
www.bosch-pt.com
Bosch’s application service team will gladly answer questions 
concerning our products and their accessories.
In all correspondence and spare parts orders, please always 
include the 10-digit article number given on the type plate of 
the measuring tool.
Great Britain
Robert Bosch Ltd. (B.S.C.)
P.O. Box 98
Broadwater Park
North Orbital Road
Denham
Uxbridge
UB 9 5HJ
At www.bosch-pt.co.uk you can order spare parts or arrange 
the collection of a product in need of servicing or repair. 
Tel. Service: (0844) 7360109
E-Mail: boschservicecentre@bosch.com
Ireland
Origo Ltd.
Unit 23 Magna Drive
Magna Business Park
City West
Dublin 24
Tel. Service: (01) 4666700
Fax: (01) 4666888
Australia, New Zealand and Pacific Islands
Robert Bosch Australia Pty. Ltd.
Power Tools
Locked Bag 66
Clayton South VIC 3169
Customer Contact Center
Inside Australia:
Phone: (01300) 307044
Fax: (01300) 307045
Inside New Zealand:
Phone: (0800) 543353
Fax: (0800) 428570
Outside AU and NZ:
Phone: +61 3 95415555
www.bosch.com.au
Republic of South Africa
Customer service
Hotline: (011) 6519600
Gauteng – BSC Service Centre
35 Roper Street, New Centre
Johannesburg
Tel.: (011) 4939375
Fax: (011) 4930126
E-Mail: bsctools@icon.co.za
KZN – BSC Service Centre
Unit E, Almar Centre
143 Crompton Street
Pinetown
Tel.: (031) 7012120
Fax: (031) 7012446
E-Mail: bsc.dur@za.bosch.com

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