Bosch GLM 40 Professional Notice Originale page 34

English | 33
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)
– Structured surfaces (e.g. roughcast, natural stone).
If necessary, use the laser target plate (13) (accessory) on these surfaces.
Inaccurate measurements are also possible where the laser is pointed at target surfaces
diagonally.
Layers of air at different temperatures and indirectly received reflections can also influ-
ence the measured value.
Accuracy Check of the Distance Measurement
You can check the accuracy of the measuring tool as follows:
– Choose a measuring section of approx. 3–10 m in length that is permanently un-
changed, the exact length of which is known to you (e.g. room width, door opening).
Bosch Power Tools 1 609 92A 7L2 | (26.04.2022)