Bosch GMS 120-27 Professional Multi Material Cable Detector

The Bosch GMS 120-27 is a professional multi-material detector designed to find live cables, metals, and wooden substructures before you drill. If you’ve ever put a hole through a live wire during a kitchen fit or cabinet installation, you’ll know exactly why a reliable Bosch cable detector earns its place in the kit bag. This one detects through dry wall at depths up to 120mm for metals and 50mm for live cables, giving you a clear picture of what’s lurking behind the surface before you commit.

What sets the GMS 120-27 apart from cheaper units is its ability to identify material type, not just presence. The display tells you whether you’ve found magnetic metal, non-magnetic metal, a live wire, or a wooden stud. That distinction matters when you’re deciding where to fix into a stud wall or routing around service runs in a refurb. No guessing, no squinting at vague signals.

How the Bosch GMS 120-27 Works on Site

Detection results show up on the display with colour-coded feedback, and the built-in marking hole lets you mark directly through the tool onto the wall surface. Mode selection is straightforward, so there’s no fiddling around with settings mid-job. The centre of any detected object is clearly identified, which is genuinely useful when you need to hit a stud accurately for a heavy wall mounting.

Built for Site Conditions

The GMS 120-27 carries IP54 dust and splash water protection and a shock-absorbing rubber casing. It runs on two AA batteries, which are included, along with a carry pouch. At 0.29kg it’s light enough to carry in a tool belt without thinking about it. For anyone doing renovation work, fitting heating systems, or installing anything that requires drilling through plastered walls, this is a practical bit of kit that pays for itself the first time it stops you hitting something you shouldn’t.