Non-Destructive Testing (NDT)

Concrete Thickness & Integrity Testing

Tablet not included

Verify Concrete Slab

» Determines Thickness

» Detects


No need to drill, core or excavate to determine concrete slab thickness.

Applicable For

Model CTG-2

» Concrete Slabs
» Concrete Pipes
» Tunnel Linings
» Core Depth Planning
» Precast Panels

» Concrete Pavements

  • Parking Garages
  • Airport Runways

» Walls

  • Precast
  • Precast Tilt-up
  • Cast-in-Place

Impact Echo Principle

Based on the Impact Echo Principle
Meets ASTM Standard C1383-04(10)


» Thickness Range

  • 3.2″ to 20″ (81 mm to 50.8 cm)
  • Optional thick mode tests up to 6′ (1.8m)

» Data Collection

works with most Windows 7 and Windows 8 devices.

» Accuracy

± 2% when calibrated on a known thickness location.

» Frequency Resolution


» Software Features

Olson’s WinCTG2 Software is used for data acquisition and analysis.

» Number of Samples Acquired Per Test


» Sampling Rate

45,454 samples/second

» Max. Nyquist Sampling Frequency

22,700 Hz

» Report Capability

use X and Y coordinates to set up a test grid. Generate a thickness summary table which can be exported to most spreadsheets in comma separated format.

» Power

Uses four readily available, nonrechargeable CR123A 3V long life lithium photo batteries.

» Weight

5 lbs (2.27 kg) combined weight of test head, batteries, cables and protective case.

» Cable Length for Test Head

3 ft (91 cm)

* To test concrete and acquire data, the CTG-2 system must be used with a Windows 7/Windows 8 computer or tablet running Olson Instrument’s WinCTG2 software.
* The required computer or tablet must be provided by the user.


  • 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 in air or on grade.
  • Works through paint 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 Olson’s default parameters.
  • Thickness data table can be imported into most spreadsheet programs.
  • Save results for later review.