Bosch Professional GMS 120 Original Instructions Manual page 26

26 | English
Nails and screws in the base material may result in wooden beams being identified as
metal objects.
If the display indicates a continuously high amplitude of the measuring indicator (i) and
the fine scale (j), re-start the measuring process again by placing the measuring tool
elsewhere on the surface.
If the light-up ring (1) does not indicate readiness to measure when positioned on the
surface to be examined, the measuring tool has not been able to detect the base material
correctly.
– Press and hold the Drywall operating mode button (11) until the light-up ring (1)
lights up green. Take the measurement as normal.
If, after having completed this measurement, you want to start a new measuring pro-
cess on another wall, briefly press the Drywall operating mode button (11) in order to
reset the measuring tool.
– In rare cases, the measuring tool is not able to detect the base material because the
sensor area (13) on the rear side is dirty. Clean the measuring tool with a soft, dry
cloth and re-start the measuring process.
Metal operating mode
Metal operating mode is particularly suited to detecting magnetic and non-magnetic ob-
jects, regardless of the nature of the wall.
To activate Metal operating mode, press the Metal operating mode button (10). The
light-up ring (1) and the operating mode indicator (4) above the Metal operating mode
button will light up green.
If the measuring tool passes over a metal object (the light-up ring (1) will light up red),
the type of metal will be shown in the display. For magnetic metals (e.g. iron) the Mag-
netic metal indicator (e) will appear, for non-magnetic metals (e.g. copper) the Non-
magnetic metal indicator (d) will appear.
Note: For reinforcement steel mesh and reinforcements in the examined based material,
an amplitude is indicated over the entire surface in the measuring indicator (i). For rein-
forcement steel mesh, it is typical that the magnetic metal indicator (e) appears directly
above the iron rods, whereas the non-magnetic metal indicator (d) will appear between
the iron rods.
Power cable operating mode
Power cable operating mode is only suitable for detecting live wires (110−230 V).
To activate Power cable operating mode, press the Power cable operating mode
button (9). The light-up ring (1) and the operating mode indicator (4) above the Power
cable operating mode button will light up green.
1 609 92A 7LE | (07.04.2022) Bosch Power Tools