Bosch Professional GLM 40 Original Instructions Manual page 15

Hold down the on/off button (5). When the required unit of measure-
ment is displayed, release the on/off button (5). After releasing, the
measuring tool switches itself on with the selected setting.
Switching sound on/off
The sound is switched on by default.
Switch the measuring tool off.
Hold down the measuring button (2) until "Sound OFF" appears on
the display (1). After releasing, the measuring tool switches itself on
with the selected setting.
Switch the measuring tool off to switch the sound back on. Hold
down the measuring button (2) until "Sound On" appears on the dis-
play (1). After releasing, the measuring tool switches itself on with
the selected setting.
Display Illumination
The display illumination is continuously switched on. When no button is pressed, the dis-
play illumination is dimmed after approx. 10 seconds to preserve the batteries. When no
button is pressed for after approx. 30 seconds, the display illumination goes out.
Practical Advice
General Advice
The reception lens (11) and the laser beam output (12) must not be covered during the
measuring process.
The measuring tool must not be moved while a measurement is being taken. For this
reason, place the measuring tool against or on a firm surface whenever possible.
Influences on the Measuring Range
The measuring range depends on the lighting conditions and the reflective properties of
the target surface. For better visibility of the laser beam in bright extraneous light, use
the laser viewing glasses (14) (accessories) and the laser target plate (13) (accessories)
or shade the target area.
Influences on the Measurement Result
Due to physical effects, the possibility of inaccurate measurements when measuring vari-
ous surfaces cannot be excluded. These include:
– Transparent surfaces (e.g. glass, water)
Bosch Power Tools
English | 15
1 609 92A 5DY | (02.07.2020)