Which materials can the Bosch GMS 120-27 detect?

The scanner detects magnetic and non-magnetic metals, live electrical wiring, and wooden substructures.

What is the maximum detection depth of this wall scanner?

It reaches up to 120 mm for non-ferrous metal, 100 mm for ferrous metal, 50 mm for live cables, and 30 mm for wood.

What power source does this tool use?

It runs on the 2 included 1.5V LR6 AA batteries. It is also compatible with an optional Bosch BA 3.7V Li-Ion battery pack.

How do you mark the exact position of a detected object?

You can mark the wall directly through the integrated marking hole at the center of the LED ring.

Is the device durable enough for demanding job sites?

Yes, it features a shock-absorbing rubber housing and an IP54 rating for dust and splash water protection.

BOSCH GMS 120-27 detector wall scanner in storage case (2x AA batteries) - 0601081700

Name: BOSCH GMS 120-27 detector wall scanner in storage case (2x AA batteries) - 0601081700
Brand: BOSCH
SKU: 08108509
Price: 104.9 EUR
Availability: InStock

Supplier number: BOSCH 0601081700 | EAN 4053423255331

Recommended Retail Price €144.60

104.90 tax incl.

€86.70 excl. VAT (incl. all environmental contributions)

On stock - immediately available | we have 2 products in stock.

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How does it work?

Purchase a participating Bosch Professional MT Li-Ion measuring tool during the promotion period and receive the matching battery free of charge.
Upload your proof of purchase via the Bosch PRO360 app before 31 January 2027 to claim your free battery.
The promotion is valid from 01.09.2026 to 31.12.2026.
Bosch PRODEALS are recognisable by the promotion label on the product page. Click the label to view all participating items.

Bosch PRODEALS 2026 - Purchase a measuring tool and receive a free battery!

Accurate drilling with the Bosch GMS 120-27

Practical benefits

Reliable multi-material detection: You effortlessly locate magnetic metals, non-ferrous metals, live wiring, and wooden studs up to a depth of 120 mm.
Direct and accurate marking: The practical marking hole and illuminated color ring allow you to mark drilling locations directly on the wall surface.
Rugged jobsite protection: Built with a shock-absorbing rubber casing and IP54 rating, your wall scanner withstands drops, dust, and water splashes.

In a nutshell

The right choise for

Drill with complete confidence using the Bosch gms 120-27 wall scanner. Whether you are mounting heavy cabinets, installing shelving, or carrying out interior renovations, this detector reliably locates magnetic and non-magnetic metals, live wiring, and wooden substructures up to a depth of 120 mm. It eliminates guesswork, prevents accidental pipe damage, and ensures you hit solid anchor points every time. The integrated marking hole in the center of the color-coded led ring lets you mark your exact drilling spot directly on the wall. Built with a shock-absorbing rubber casing and an IP54 rating, it easily withstands tough jobsite conditions. The scanner comes ready to work in a protective pouch with two 1.5V aa batteries included.

Product information FAQ

€104.90

In stock - tax incl.

Key features according to our expert

Max. detection depth: 120 mm
Supplied in: Case

Scope of delivery

2x 1.5 V LR6 battery (AA)
Storage case

Product description

Clear and simple: the intuitive wall scanner that makes the invisible visible

Provides confidence by detecting metal, live cables and wooden substructures
Easy to use with simple mode selection and marking hole
Built for a rugged working environment thanks to shock-absorbing rubber casing and IP54

Product highlights

When drilling into a wall, the job needs to be done with confidence that no obstacle will be hit. With our GMS 120-27 Professional wall scanner, objects can be detected uncomplicated and intuitively. Detection results appear via a signal indication on the display and colour-coded marker hole. The user-friendly detector offers easy mode selection and it is possible to mark through the marker hole exactly where objects have been detected. The robust GMS 120-27 was developed for rugged construction sites with IP54 dust and splash water protection plus a shockproof rubber housing.

Equipment and application

Our GMS 120-27 Professional wall scanner helps detect and locate metals, live cables and wooden substructures behind drywall walls. Locating objects in walls before drilling ensures greater safety at work, especially for professionals carrying out remodelling work, when fitting cabinets, kitchen worktops, sinks, boilers and heating systems or installing air conditioning and sprinkler systems.

Additional information

Not only does this scanner identify the centre of the detected object, it also indicates the material properties, e.g. whether the object is magnetic or non-magnetic metal, a live conductor, or is a non-metallic object.

All Features

Max. detection depth: 120 mm
Supplied in: Case
Length x width x height: 186 x 86 x 33 mm
Electrical power supply: 2 x 1.5 V LR6 (AA)|2 x 1.2 V HR6 (AA)|1 x BA 3.7V 1.0Ah Li-Ion battery
Detection depth, ferrous metal, max.: 100 mm
Additional function: Marking hole
Detection depth, wooden substructures, max.: 30 mm
Detection depth, current-carrying pipes, max.: 50 mm
Material identification: Ferrous metal|Non-ferrous metal|Current conductor|Non-metallic material
Detection depth, non-ferrous metal, max.: 120 mm
Dust and splash water protection: IP 54
Bosch radar technology: no

Brand BOSCH
08108509
EAN 4053423255331
Supplier number BOSCH 0601081700
Warranty Up to 5 years warranty on Bosch Professional and up to 3 years on Bosch DIY after successful registration!

Frequently asked questions about this product

Answered by specialists

Which materials can the Bosch GMS 120-27 detect?: The scanner detects magnetic and non-magnetic metals, live electrical wiring, and wooden substructures.
What is the maximum detection depth of this wall scanner?: It reaches up to 120 mm for non-ferrous metal, 100 mm for ferrous metal, 50 mm for live cables, and 30 mm for wood.
What power source does this tool use?: It runs on the 2 included 1.5V LR6 AA batteries. It is also compatible with an optional Bosch BA 3.7V Li-Ion battery pack.
How do you mark the exact position of a detected object?: You can mark the wall directly through the integrated marking hole at the center of the LED ring.
Is the device durable enough for demanding job sites?: Yes, it features a shock-absorbing rubber housing and an IP54 rating for dust and splash water protection.