Bosch GMS120 Digital Wall Scanner Product Code: 76455

Multifunction wall scanner for the detection of studs, copper pipe, metal pipe and live wires.


  • 3 x Detection Modes
  • Detection Depth 3.8-12cm
  • Centre Finder Function
  • 3 Year Manufacturer's Guarantee
  • LED Marking Hole
  • Colour-Coded Indicators
  • Automatic Calibration


Calibration-free. Max. detection depth: stud 3.8cm, copper pipe 8cm, metal pipe 12cm and live wire 5cm. L x W x H: 220 x 97 x 120mm. 4 x 1.5V batteries included.
Additional Information
Technical Specification
  • Brand : Bosch
  • Total Product Weight : 0.7 kg
  • Model No : GMS120
  • Pack Size : 1
  • Manufacturer Guarantee : 3 Year Manufacturer’s Guarantee (Registration Required, T&Cs Apply)
  • Pieces in Pack/Case : 1
Product Contents
Delivery & Returns


Standard delivery service up to 3 working days: €8.95

Free delivery on all orders over €70.00

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Was €121.95

Special Price €94.95

Incl. 23% VAT

Save €27.00 (22%)

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Bosch GMS120 Digital Wall Scanner is rated 2.8 out of 5 by 18.
Rated 1 out of 5 by from not happy at all this item didnt find a live cable 22mm below a plaster wall. hence i took it back. also the battery that came with the item over heated in my pocket to a point i couldnt hold it. i buy allot of bosch gear this to be fair is the first time im not happy with the kit
Date published: 2017-01-04
Rated 4 out of 5 by from Office move, life saver. Moving into a new office, always a chore to find the studs to hang TV's. Worked even through ply backed plasterboard, and alerted us to a rogue lighting cable loop.
Date published: 2017-01-03
Rated 1 out of 5 by from Huge waste of money. This 3 function tool fails on all 3 functions. The LCD display is invisible when the tool is raised above eye level. The stud detector is very uncertain and the live wire function over-rides all other functions. Hard pads on face of detector left marks on emulsion wall. I tried to master it for 4 days then took it back for a refund. BOSCH should rethink the whole thing.
Date published: 2016-11-17
Rated 1 out of 5 by from Awful As a keen DIYer in a new house I thought this would save me lots of time locating studs and existing wires/pipes. It, however, cost me lots of time as it gives so many false positive readings I had to check with more conventionaly methods anyway. When it failed to find a live wire that I knew was there it immediately became an expensive paperweight. Waste of money.
Date published: 2016-06-01
Rated 5 out of 5 by from Tickety Boo Tool Bought this to find cables and studs in a wall, had no problems at all. Detected cables 50mm under insulation board. Simple controls and a clear intuitive display. Bosch Professional quality and Screwfix service, a cracking match.
Date published: 2015-12-01
Rated 1 out of 5 by from Bosch GMS120 Scanner I've had this model for a while now and find it unreliable. It has failed to detect live ring main cables behind plasterboard more than once. On the plus side, it is easy to handle and use (hence 3 stars for features), comes with a soft case that's handy on site and is ok for stud location.
Date published: 2015-09-07
Rated 1 out of 5 by from Near useless Summary: this Wall Scanner is so unreliable that it can't even locate objects or structures whose precise position is already known. Like many a tool buyer, I decided to spend the extra to get a fully-featured device. I thought that this Bosch would be a useful tool for the major house renovation I am undertaking. My first few tasks were locating studs in standard domestic walls. The four walls I initially scanned were all plain partition walls, ie presumed free of any objects other than low-level socket wiring, plasterboard nails, and perhaps some cross-bracing in the studding. No matter how carefully and methodically I used the Bosch - e.g. allowing it calibrate, moving to different areas of the wall, slowly re-scanning each area - the device appeared incapable of generating a distinct signal over a stud. In each case I resorted to the traditional expedient of tapping the wall to locate the stud, and confirming its location and edges with a bradawl. Pathetically, the Bosch only identified about half of these located studs, and those results were swamped by the mass of false signals it generates over all areas. The Bosch's final failure came when I ran it over a stud wall where the backside of the wall had been stripped of plasterboard, thus exposing the studwork. Scanning this wall clearly demonstrated that the pattern of signals from the Bosch had only a random correlation with the studs and other objects in the wall. Using the Bosch in its cabling location mode, it was the same story - a mass of false signals that obscured any actual positive results. By contrast, a cheap DIY cable locator had no problem in pinpointing the target cables. The Bosch is further let down by very poor instructions, which in particular do not have any troubleshooting guide that might help with the situations described. Its possible that my Bosch is faulty; however there is no service indication displayed, and its main functions seem to be operable. The problem seems to be that the device is far too sensitive, and that it simply cannot cope with conditions outside of its design laboratory.
Date published: 2015-02-03
Rated 1 out of 5 by from Expensive mistake This scanner is hit and miss and not as good as YouTube review videos would lead you to believe. As a professional Joiner / Carpenter I expected a lot more from the Bosch brand, however considering the price it's better aimed at the DIY user thinking they are buying professional kit!
Date published: 2014-11-05
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