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Bosch GMS120 Digital Wall Scanner (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

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£79.99INC VAT
Was £99.99 Save £20.00 (20%)

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Rated 2.7 out of 5 by 10 reviewers.
  • 2016-10-23 T09:06:14.641-05:00
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Rated 1 out of 5 by 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. 1 Jun 2016
Rated 5 out of 5 by 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. 1 Dec 2015
Rated 1 out of 5 by 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. 7 Sep 2015
Rated 1 out of 5 by 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. 3 Feb 2015
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1 Question  1 Answer

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13 Jan 2016
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, Builder/Multi Trade
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Hi, thanks for your question. Generally these types of cable will not be detected, they will not have a strong enough current to register as live wires and will not have enough metal content to show up in metal detection mode (which is intended for finding pipes, reinforcing steel or similar). If the ethernet or telephone cables were contained within a metal conduit however then this would show up in the normal metal detection mode.
3 Feb 2016
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Brand Bosch
Manufacturer Guarantee 3 Year Manufacturer's Guarantee
Model No GMS120
Pack Size 1
Pieces in Pack/Case 1
Total Product Weight 0.7 kg

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.


Instruction Manual