Materials Testing


  • Detects: Honeycomb, Voids, Cracks and Delamination
  • Determines Thickness Based on Impact Echo Principle

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Verify Concrete Slab Thickness & Integrity
No Coring — No Drilling — No Excavating

Meets ASTM Standard C1383

Concrete Thickness Gauge, an Impact-Echo device. This hand-held instrument tests concrete slab thickness and integrity. The CTG-2 is an easy to use, battery-powered, device.

Requires no special knowledge or training – connect the CTG-2 to your laptop or tablet and start testing with WinCTG2 software. For greater accuracy, calibrate the unit at a location of known thickness to obtain the concrete velocity for that job.


  • Elevated Slabs (i.e. Bridge Decks, Parking Garages)
  • Slabs on Grade (i.e. Roads, Runways & Floors)
  • Walls & Precast Panels
  • Ceilings
  • Tunnel Linings & Concrete Pipe
  • Columns & Beams
  • Foundations (thicknesses up to 6 feet)


  • Ruggedized, hand-held test head with integrated displacement transducer and solenoid impactor
  • No coupling agents required for use of test head on concrete
  • Works on cured, hardened concrete of an elevated deck or on grade
  • Works through paint, epoxy, and most types of bonded ceramic tile
  • Switch between English (inches) or Metric (millimeters) units with the click of a button
  • Easy velocity calibration at known thickness location, or use default parameters
  • Thickness data table can be imported into most spreadsheet programs
  • Save results for later review


Thickness Range3.2" to 20" (81 mm to 50.8 cm) in standard mode
20'' to 6' (50.8cm to 1.8m) in thick mode
Accuracy± 2% when calibrated on a known thickness
Data CollectionWorks with most Windows 7-10 devices
Frequency Resolution10Hz
Sampling Rate45,454 samples/second
Numbers of Samples Acquired per Test4,545
Maximum Nyquist Frequency22,700 Hz
Cable Length for Test Head3 ft (91 cm)
Software FeaturesAutomatic Thickness Picking
Manual Thickness Picking
Concrete Velocity Calibration
Time & Spectral Data: Displays for Data QA
Report CapabilityUse X and Y coordinates to set up a test grid
Generate a thickness summary table exported to most spreadsheets in comma separated format
PowerCR123A 3V long life lithium batteries
Weight5 lbs (2.3 kg) shipping weight
1 lb (0.5kg) Test Head

*To test concrete and acquire data, the CTG-2 system must be used with a Windows 7-10 computer or tablet running WinCTG2 software. The required computer or tablet must be provided by the user.