How it works (see figure A)

Position the measuring tool on/against the surface being inspected. The light-up ring (2) will light up to indicate readiness to measure.

Hold the measuring tool uniformly by the gripping surface (8). Do not change your grip during the measurement and, in particular, do not touch the sensor area (11).

Always move the measuring tool in a straight line in direction B over the surface, applying light pressure, without lifting it off or changing the pressure. The measuring tool should primarily be moved transversely to the object you are searching for. If you do not know how the object is aligned in the wall, perform a cross measurement (see figure B).

Detection Indicators:

• If no object is detected below the sensor area, the light-up ring (2) will light up green and no audio signal is issued.
• When the measuring tool approaches an object, the light-up ring (2) will light up red. The closer the tool gets to the object, the faster the tempo of the audio signal gets.
• When over the centre of an object, the object centre indicators (1) light up and continuous tone sounds. The light-up ring (2) will continue to light up red.
• When the measuring tool moves away from the object, the object centre indicators (1) will turn off and the audio signal will sound more slowly.

Objects are only displayed roughly the first time you move over the centre and boundaries of the object.
In order to locate the exact centre of an object, move the measuring tool back in the direction of the object without lifting it off until the object centre is indicated again (the object centre indicators (1) will light up).
In order to locate the boundaries of the object with greater precision, continue to move the measuring tool in a straight line from the object's centre until the light-up ring (2) is no longer lit up red.

The marking hole (3) is located above the central measuring point. If necessary, you can use this to mark the centre or boundaries of the object.

Note: After you have marked an object through the marking hole (3) (e.g. with a pencil), you will need to start a new measurement because the measurement may be impaired by the pencil.

• The cable must be live. You should therefore connect electricity consumers (e.g. lights, appliances) to the electricity cable you are trying to find. Switch on the electricity consumers to ensure that the electricity cable is live.

• The 50–60 Hz signal from the electricity cable must be able to reach the measuring tool. If the cable is in damp walls (e.g. > 50 % humidity), behind metallic foil (e.g. thermal insulation) or in an empty metal pipe, the signal will not reach the measuring tool and you will not be able to find the cable.

• The measuring tool must be sufficiently earthed. To do this, hold it firmly (without gloves) by the gripping surface (8). Make sure that you are in good contact with the floor. Insulating shoes, ladders or platforms may compromise your contact with the floor. The floor must also be earthed in order for live cables to be detected.

• The 50–60 Hz signal from the electricity cable must be stronger along the cable than in its immediate vicinity. If the wall is very damp or poorly earthed, the signal will be the same strength throughout the wall. This will result in the measuring tool indicating that it has found a signal over a large area, but it will not be able to detect the exact location of the cable.
  In this instance, it may be helpful to place your free hand on the wall 20–30 cm from the measuring tool in order to conduct the signal away from the wall. However, you should not change the position of your free hand during the measuring process.

• Multi-phase (known as three-phase current or heavy current) electricity cables cannot be detected as live cables because the signals from the different phases cancel each other out. You can, however, detect multi-phase electricity cables at shallow depths as metal objects.

• Conductive wall surfaces, such as certain tiles, may result in electricity cables no longer being indicated or the light-up ring (2) lighting up red over a large area.

• Flat lying electricity cables (up to max. 2–3 cm in depth) may also be indicated as metal objects. However, this does not apply to solid-wire cables.

• Wider objects can be identified by the light-up ring (2) lighting up red over a wide area. Under certain circumstances, wide objects may not be indicated to their entire extent.