EquipmentAcoustic Concrete Tester (ACT)

The Acoustic Concrete Tester (ACT) measures the concrete thickness of pavements, slabs, retaining walls, foundation footings and tunnel linings. It is a nondestructive concrete thickness gauge that identifies flaws such as delaminations, voids, and spalls.

The ACT is battery operated and available for field use in all weather conditions. It works for concrete structures from 75 to 900 mm (3 to 35 inches) thick.

Using Ultrasonic Echo Technology, ACT generates a broadband pulse that includes all frequencies to accurately determine the thickness of the structure. Measuring thickness with the ACT consists of placing two small probes on the structure to be tested and touching the ACT screen. As the structure responds to its natural frequency, its thickness is displayed on the high visibility ACT screen. The ACT also calculates the wave speed of structures of unknown thickness.

The ACT easily self calibrates the concrete wave speed prior to the test, and takes seconds to measure the thickness of the concrete.


  • Size (H x L x W): 75 x 175 x 235 mm
  • Weight: 2.2 KG
  • Display: Large backlit transflective VGA touch screen for any lighting conditions
  • Operating Temperature: 0˚ to 50˚ C
  • Storage Temperature: -20˚ to 65˚ C
  • Battery: Internal, 8 hours duration, rechargeable with fast charger (3 hours)


Microprocessor PXA 255 XSCALE up to 400 MHz
Data storage on Flash card up to 128 MB Sampling digitizing frequency greater than 1 MHz (net frequency after DSP 192 KHz) Sampling frequency accuracy within 0.01%.


Material resonant frequency from real time FFT. Generates output graphs to illustrate reports. Screen may be personalized with company logo. Probes attach to ACT Telescoping Pole for convenient testing.


  • Materials: Brass
  • Dimensions: 60 mm diameter, 45 mm length
  • Weight: 0.5kg
  • Cable Length: 2.4m
  • Transmission Wide Band Transmission
  • Receiving Frequencies 2 - 30 KHz
  • Resonant Frequency: > 36 KHz

Matched, interchangeable transceivers. Optional Underwater probe available

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