• Concrete Surface Resistivity

Concrete Surface Resistivity

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Surf is a laboratory non-destructive test device for rapid, easy and accurate measurement of the surface electrical resistivity of concrete based on the four-probe (Wenner-Array) technique according to AASHTO TP 95-11, and pending ASTM specifications.

Surf has a unique and customized setup, which enables the measurement of electrical resistivity with high accuracy by reducing the duration of the test and minimizing ambient effects. The Surf provides a test cradle for 4"x 8" cylinders, which provides four (4) 4-sensor arrays positioned at 90° intervals around the cradle. Surf's patented technology automatically takes measurements at each of the sensor points around the cylinder and then repeats the process for all 8 measurements in less than 15 seconds. The included PC software takes this information and generates the reports required by the Standards.



  • Performance-based, quality control testing of concrete
  • Estimation of chloride diffusion coefficient of concrete
  • Service-life design of concrete structures
  • Estimation of the remaining life of concrete structures
  • Crack detection in concrete elements under load
  • Monitoring the setting time of fresh concrete



  • Patented technology
  • Fully compliant with both AASHTO TP95 and the upcoming ASTM standard
  • Fast measurement (8 measurements < 15s)
  • Four-channel surface resistivity meter
  • Variable frequency (13 - 100 Hz)
  • Limits moisture loss
  • Automatic report generation with PC software
  • Fresh concrete testing/crack detection applications


Replacement part
HG-9032 Giatec SURF Verification Kit, High and Low range
HG-9033 Giatec SURF™ Test Cable, Four-point with clip
HG-9034 Giatec SURF™ Contact Sponge Set, 16 pcs.
HG-9038 Giatec SURF™ Conductive Gel - High Viscosity, 250 ml bottle
Measurement Channels 4
Measurement Display on LCD Yes
LCD Display Area 65 x 33 mm
Dimensions of Device 200 x 160 x 70 mm
Software Surf Data Monitor