Bosch Professional GMS 120 Original Instructions Manual page 25

Wider objects in the base material can be identified by a continuous high amplitude of
the measuring indicator (i) and fine scale (j). The light-up ring (1) will light up yellow.
The duration of the high amplitude corresponds approximately with the object width.
If very small or deep-lying objects are being sought and the measuring indicator (i) reacts
only slightly, move the measuring tool repeatedly over the object in a horizontal and ver-
tical direction. Pay attention to the amplitude of the fine scale (j) and, when in Drywall
and Metal operating modes, to the object centre indicator CENTER (k) as well, which will
then allow for precise detection.
Before drilling, sawing or routing into walls, refer to other sources of informa-
u
tion to ensure that you eliminate hazards. As the measuring results can be influ-
enced through ambient conditions or the nature of the wall, there may be a hazard
even though the measuring indicator (i) does not indicate an object in the sensor
area, no audio signal sounds and the light-up ring (1) lights up green.
Operating Modes
You can achieve the best possible measuring results by selecting the correct operating
mode. You can achieve the maximum detection depth for metal objects in the Metal op-
erating mode. You can achieve the maximum detection depth for live wires in the Power
cable operating mode.
The selected operating mode is always shown by the green operating mode
indicator (4).
Drywall operating mode
Drywall operating mode is designed for detecting wooden and metal objects in dry walls.
To activate Drywall operating mode, press the Drywall operating mode button (11). The
operating mode indicator (4) above the Drywall operating mode button will light up
green.
As soon the measuring tool is positioned on the surface to be examined, the light-up
ring (1) will light up green, indicating readiness to measure.
In Drywall operating mode, all available objects will be detected and displayed:
(c) Non-metallic, e.g. wooden beams
Non-magnetic, but metal, e.g. copper pipe
(d)
(e) Magnetic, e.g. reinforcing steel
(f) Live, e.g. power lines
Note: In the Drywall operating mode, other objects, e.g.water-filled plastic pipes, will be
also displayed in addition to wooden and metal objects and live wires. For these objects,
the Non-metallic object indicator (c) will appear in the display.
Bosch Power Tools
English | 25
1 609 92A 7LE | (07.04.2022)