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• During the scan, all three of contact pads
11 must always have contact with the
surface.
• Make sure that your fingers of the hand
holding the detector do not touch the
surface being scanned, which could
interfere with the tool's ability to effectively
detect items below the surface.
• Do not touch the surface being scanned
with your other hand or any other part of
part of your body, because the moisture
may affect the scanning.
• Always measure SLOWLY to achieve
maximum sensitivity.
DETECTION THROUgH SPECIAl
SURFACE mATERIAlS
lath and Plaster
Because of the uneven thickness of the
plaster, it is difficult to detect wood studs
using the wood detection mode. It will
probably be easier to locate the studs by
changing to the metal-detection mode to
locate the nails that hold the lath to the studs.
Textured or Acoustic Walls and Ceilings
When scanning a wall or ceiling with an
uneven surface, place thin cardboard on
the surface to be scanned and scan over
the cardboard. In wood-detection mode,
calibrate with cardboard in place.
Wood Flooring, Wood Subflooring and
Drywall Over Plywood Sheathing
Because of the thickness of these materials,
it is difficult to detect wood joists or studs
using the wood-detection mode. It will
probably be easier to locate these items by
changing to the metal-detection mode to
locate the nails that hold the materials to the
joists or studs.
Carpeting
The GMS 120 cannot detect wood studs and
joists through carpeting. It might be possible
to use the metal-detection mode to locate
nails or screws that were used to attach the
wood floor to the joist.
mARKINg OBJECTS
Detected objects can be marked as required.
Once you have found the limits or the center
of an object, simply mark the sought after
location through the marking opening 2.
It is a good idea to establish a consistent
practice of making one type of mark over
places in which you do not want to penetrate
(drill, nail, cut), such as O, and a different
symbol over places in which you do want to
penetrate, such as an X.
Switching On and Off
Before switching the detector on, make
sure that the sensor area 12 is not moist.
If required, wipe the detector dry using a
cloth.
If the detector is subject to an extreme
temperature change, allow it to adjust to
the ambient temperature before switching
it on.
To switch the tool on/off press the on/off
button 5.
• If none of the buttons are pressed for
approx. 5 minutes, the tool switches off
automatically in order to extend the service
life of the battery.
Switching the Display Illumination On/Off
The display illumination can be switched on/
off with the display illumination button 6.
Switching the Audio Signal On/Off
The audio signal can be switched on/off with
the audio signal button 7. When the audio
signal is switched off, indication a appears on
the display.
OPERATION mETHOD
(see figures A - B)
The tool checks the surface of sensor area
12 in measurement direction A to the max.
detection depth (see "Technical Data").
Always move the tool in a straight line over
the surface applying slight pressure, without
lifting it off or changing the pressure. During
the scan, the contact pads 11 must always
have contact with the surface.
Detecting Procedure
Position the detector on the surface, and
move it in direction B.
When the detector comes closer to an
object, then the amplitude in indicator i
increases and ring 1 lights up orange with
no tone signal; when it moves away from the
object, the amplitude decreases.
At the position of maximum amplitude, the
object is located approximately below the
center of the sensor. Illuminated ring 1
becomes red and a steady audio tone is
emitted.
Note: The indications of illuminated ring 1
and amplitude indicators i and j may vary
depending on other factors including width
of the object below the surface, thickness
of the surface materials, strong magnetic or
electromagnetic fields, moisture, proximity
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