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Bosch GMS120 Digital Multi-Scanner
Bosch GMS120 Digital Multi-Scanner 1
Bosch GMS120 Digital Multi-Scanner Details
Bosch GMS120 Digital Multi-Scanner-How to use

Bosch GMS120 Digital Multi-Scanner

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The Bosch GMS120 Digital Multi-Scanner is a versatile tool designed to enhance the efficiency of your construction or renovation project. With its ability to detect different types of materials behind surfaces, it's an indispensable asset for professionals and DIY enthusiasts alike. This review aims to provide an in-depth analysis of the GMS120, covering its design, features, performance, and overall value.

Bosch GMS120 Digital Multi-Scanner's Specifications

  • Multi-Component Scanner: It can scan a variety of components including ABS/Airbag, transmission, engine (including hybrid systems), body, and restraints.
  • Patented 5-BUSTM Technology: This allows simultaneous bi-directional communication with all vehicle systems. It extracts comprehensive data from all trouble codes to diagnostics.
  • Compatibility: It is compatible with over 350 vehicle makes covering over 2.5 million vehicles. It supports both domestic and import cars from 1996 and newer.
  • Graphical Color Display: It has a 3.8-inch color TFT display for easy viewing of scan data, code information, graphs, and test measurements.
  • Self-Diagnostics: It performs self tests at startup and while in use to ensure proper operation.
  • Freeze Frame: It can display any available freeze frame data for more accurate diagnostics.
  • Data Display: It displays not only trouble codes but Technical Service Bulletins, recalled models, tested systems status, live data and more.
  • Connectivity: It can connect to a PC via USB to use with supplied Ross-Tech VCDS software for advanced diagnostics.
  • Smart Waveform Analysis: It can perform advanced diagnosis by displaying analog sensor output in graph form.


The GMS120 is designed with practicality and ease-of-use in mind. Its compact and lightweight structure, weighing just 0.49 kg, allows for convenient portability and handling. The device fits comfortably in the hand, and its ergonomic grip enhances control during operation. It's cased in robust plastic, ensuring durability while maintaining a sleek aesthetic.

The interface features a large illuminated display, providing clear readings in various lighting conditions. The buttons are well-placed and tactile, making navigation through the modes straightforward. The device also includes a marking hole and a ring for a pencil, allowing for precise marking of detected objects.


One of the GMS120's most notable features is its three-mode detection system. It offers modes for wood, metal, and live wiring. This multi-detection capability allows for a versatile range of applications, from installing TV mounts to drilling holes for wiring.

The wood mode uses a backlit ring that turns green when it detects wooden studs, joists, or beams behind drywall or plywood. It can detect wood up to 19 mm deep. The metal mode, which can detect steel up to 120 mm deep, is invaluable for scanning surfaces before drilling to avoid hitting pipes or metal studs. The AC wiring mode detects live cables up to 50 mm deep, helping prevent electrical accidents during your project.

The GMS120 also features a self-calibration function, which automatically adjusts to the material being scanned to provide the most accurate reading. Additionally, it offers an automatic center finder, which pinpoint the center of the object being detected, providing guidance for precise drilling.


In terms of performance, the Bosch GMS120 excels across the board. It offers a reliable and accurate scanning capability for different materials. The device's ability to differentiate between different types of materials is largely accurate, minimizing the risk of false positives.

The wood detection mode performs admirably, accurately locating studs in walls and ceilings. The metal detection mode is equally impressive, identifying both ferrous and non-ferrous metals with precision. The live wire detection mode is particularly noteworthy, given the critical safety implications. It reliably identifies live wires, providing a crucial safeguard against potentially dangerous drilling mishaps.

The automatic calibration feature significantly contributes to the GMS120's performance. By adjusting to the material being scanned, it ensures the most accurate reading possible. The automatic center finder provides an added layer of precision, allowing for meticulous drilling or cutting operations.

Value and Final Thoughts

The Bosch GMS120 Digital Multi-Scanner delivers excellent value for its price point. While there are cheaper alternatives on the market, the GMS120's combination of robust design, advanced features, and reliable performance justifies its higher cost. It's a worthwhile investment for both professionals and DIY enthusiasts seeking to avoid costly or dangerous mistakes.

The GMS120 isn't without its drawbacks. It may struggle with detecting objects at its maximum specified depth, and it could underperform on certain materials or wall types. However, these issues are relatively minor and don't significantly detract from the overall value of the device.

In conclusion, the Bosch GMS120 is a high-quality, versatile tool that excels in its intended applications. Its superior design, comprehensive detection capabilities, and accurate performance make it a standout choice in its category. Whether you are a professional tradesperson or a home improvement hobbyist, the GMS120 offers a reliable solution to ensure your projects are carried out safely and efficiently.