Bosch GMS 120-27 120mm Under-Wall Cable, Metal and Wooden Beam Detector

When drilling into a wall, you want to get the job done with the certainty that you will not hit a dangerous obstruction. Our wall scanner and Bosch metal detector GMS 120-27 Professional allows you to detect objects simply and intuitively, ensuring maximum operational safety. Detection results are displayed via clear indications on the display and through the practical color-coded marking hole (green, orange, red).

This extremely easy-to-use Bosch metal detector offers quick mode selection and allows you to precisely mark the spot where objects have been detected. The robust GMS 120-27 was developed specifically for intensive use on construction sites: it boasts IP54 protection against dust and splashing water and a rubber casing designed to absorb accidental impacts.

Equipment and application

Our professional scanner helps accurately locate ferrous and non-ferrous metals, live electrical cables, and wooden beams within drywall. Using a Bosch metal detector before drilling is essential for tradespeople and renovators who need to install electrical panels, kitchen cabinets, sinks, water heaters, or air conditioning systems without risk.

Detection performance and materials

This scanner not only identifies the center of the object but also indicates the characteristics of the detected material. Here are the depth capabilities of the GMS 120-27:

• Ferrous metals (e.g., iron): detection up to 120 mm.

• Non-ferrous metals (e.g., copper): detection up to 100 mm.

• Live cables (50–60 Hz): localization up to 50 mm.

• Wooden beams (drywall): detection up to 30 mm.