Display Illumination; Practical Advice - Bosch GLM 40 Professional Manual Original

32 | English
Press and hold button (4) [Func] until "∓" and "Sound" flash on the
display. "On" is shown at the bottom of the display.
Press button (6) [+] or button (3) [–] to switch off the sound. "OFF"
is shown at the bottom of the display.
To switch on the sound, press button (6) [+] or button (3) [–] again.
To exit the menu item, press the measuring button (2) [ ] or the on/
off button (5) [ ]. The selected setting remains saved after you switch off the measuring
tool.

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) (accessory) and the laser target plate (13) (accessory) 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)
– Reflective surfaces (e.g. polished metal, glass)
– Porous surfaces (e.g. insulating materials)
1 609 92A 5DX | (27.01.2020) Bosch Power Tools