The Most Complete Concrete Scanning System

Flex NX®, powered by Nexus™ is the industry’s most powerful and efficient concrete scanner. The all-in-one design offers a large and integrated touchscreen display, providing intuitive interface with minimal navigation.

New data collection modes harness the power of simultaneous standard and cross-polarized antennas, Flex Mode for quick prospecting, and live viewing on a paired phone or tablet. Use Flex NX on its own, or pair an NX wireless satellite antenna for a flexible solution to any concrete scanning problem. When you’re done, simply upload your results to GSSI Fusion and quickly create an informative and great-looking report.

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    17.8 cm (7 in)
    High Resolution Touchscreen


    Flex NX and NX25: 0-75 cm (0-30 in)
    NX15: 0-100 cm (0-40 in) typical, 0-150 cm (0-60 in) based on site conditions


    -20°C to +50°C (-4°F to +122°F)


    Comprehensive training
    2-year warranty

  • Simple

    Concrete Scanning Made Easy

    Wireless Made Easy
    Flex NX® allows for effortless pairing of wireless NX accessory antennas using Tap-to-Connect technology as well as wireless data transfer and software updates.

    Get the Full Picture
    Flex NX gives you the full picture by introducing a one-pass cross polarization design that enables you to quickly and easily locate and identify targets.

    Make the Complex Simple
    Use Flex NX’s innovative Flex Positioning system to quickly identify areas of interest in real-time without the need for complicated setups or grids.

    Deliver Results
    Accurately mark your findings on the ground, then easily create and send interactive reports before you leave the jobsite.

  • Flexible

    Don't Settle for Incomplete Solutions

    Tackle Any Job
    The flexibility of your Flex NX and NX wireless antennas allows you to succeed no matter what the jobsite throws at you.

    The Versatility You Need
    View results directly on your Flex NX or quickly connect any phone or tablet for different display options when the situation requires it.

    Choose Your Setup
    The Flex NX and NX antennas are designed with a universal mount to help reduce fatigue and provide better ergonomics. Switch between the handle, extension pole or off the shelf mounting accessories.

    Complex Problems, Many Solutions
    Data needs to be easy to collect and view. Flex NX provides multiple data collection and visualization modes, including LineScan, Focus Mode, and the new, innovative Flex Mode. Now you have the flexibility you need to deliver trusted results.

  • Trusted

    Your Trusted Partner

    You trust GSSI, the equipment we make and the results that you get from your system. In return, your customer trusts you.

    Every product we offer, including Flex NX, is built and tested with your jobsite environment in mind. Extreme heat, cold, dust and water are no match for your Flex NX system.

    Jobsite Proven

    • Rated IP65
    • -20°C to +50°C (-4°F to +122°F)
    • High capacity Lithium-ion batteries

    We’ve Got Your Back
    In addition to our industry-leading two year equipment warranty, our promise to you is to provide comprehensive training, unrivaled customer support and world class expertise.


The wireless NX25 antenna accessory is a perfect match for Flex NX® when needing to scan hard to reach areas, walls, and ceilings. (shown with Flex NX)

Depth Range:0-75 cm (0-30 in)

Pair the NX15 antenna accessory with Flex NX® to scan thick slabs, slab on grade, columns, or any situation where traditional concrete scanners come up short. (shown with Flex NX)

Depth Range:0-100 cm (0-40 in) typical, 0-150 cm (0-60 in) based on site conditions
Data Examples

Without seeing both standard and cross polarized data together, you’re only getting part of the picture. Flex NX’s dual channel mode helps to reveal and identify targets that can’t always be seen with just one channel.

This example shows a suspended slab with a top rebar layer above a hard-to-see PVC electrical conduit. Data from the standard antenna (top) shows a series of high amplitude rebar targets obscuring the PVC conduit (blue dot). The cross pol data (bottom) shows the hidden PVC conduit and the clearly defined bottom of the slab interface (orange box). Also visible are the structural elements supporting the slab.


Easily switch between single channel and dual channel display modes depending on what you need to see. All modes support accurate placement of labeled targets using Flex NX’s easy to use target tagging feature.

This example was collected with Flex NX on the concrete foundation of a large commercial building. Additionally, this data shows a layer of large rebar within the foundation. The concrete-air interface is the long flat reflector (blue box) at the bottom of the data file.

NX15: See Deeper Targets

Deeply buried targets below non-reinforced concrete. This profile highlights NX15’s ideal combination of resolution and depth penetration. Note the excellent detail at the slab/grade contact, and the highly visible utility targets at the bottom of the profile.

NX15: Clearly Resolve Near Surface Targets

This data was collected with the NX15 accessory antenna and shows numerous targets beneath reinforced concrete slab. Each strand of the shallow wire mesh reinforcement is visible, while closely spaced subgrade targets are clearly defined.


The Powered by Nexus™ platform unlocks endless possibilities for collecting and viewing data. Flex Mode turns your Flex NX into the simplest and most flexible handheld imaging system in the industry by removing the need for complicated setups, additional positioning systems or grids.

Flex NX truly changes the way you can do your job.

Freely explore and quickly evaluate an area of interest. Focus your scanning on the regions that matter the most.
The more you scan, the clearer the image becomes.


Flex Mode generates 3D GPR data in stunning detail without using grid pads or other grid layout methods. Use Top Down View to scan a 120 cm x 60 cm (4 ft x 2 ft) area, and slice from top to bottom to quickly visualize slab contents.

This example shows a Flex Mode scan in Top Down view. This dataset was collected with an average scan spacing of 2.5 cm (1 in), providing the resolution to distinguish two crossing conduits positioned above a rebar mat.


Flex Mode incorporates a fully rotatable 3D Volume View enabling you to observe your data at different angles. 3D Volume View adds a new dimension to field analysis by revealing vertical relationships between targets of interest.

This example demonstrates the power of Flex Mode’s 3D Volume View. The 3D Volume model was rotated to further prove that the crossing conduits were installed above the rebar mat.


Flex Mode allows you to scan your way, whether you want to capture a broader context for targets or focus directly on your area of interest. Use Flex Mode to scan a smaller area to refine your mark out with no loss of resolution or image quality.

This example shows a refined Flex Mode scan in Top Down view. This scan did not fill the entire 120 cm x 60 cm (4 ft x 2 ft) area, but it still revealed enough detail to set the stage for a traditional 2D mark out.

System Includes
  • Flex NX® with adjustable handle
  • Lithium-ion battery (2)
  • US & Canada: Dual-bay battery charger
  • International: Dual-bay battery charger with AC adapter and four (4) international plugs
  • Rugged transit case
  • Safety wrist strap
  • Quick start documentation
  • 2-year warranty
Operational ModesSingle, dual or merged channel LineScan, Focus Mode, Flex Mode
Storage200 GB
Operating Temperature-20°C to +50°C (-4°F to +122°F)
IP RatingIP65
PowerLithium-ion battery
Dimensions25.3 x 13.2 x 18.9 cm (9.9 x 5.2 x 7.4 in)
Weight2.2 kg (4.9 lbs) including battery 2.4 kg (5.3 lbs) including battery and handle
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