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correlated well with important durability parameters
investigating the micro-structural properties of concrete
automatic 4-channel resistivity measurement
fast and easy method of quality control
Wide resistivity range

Concrete Surface Resistivity

Giatec Surf™ is a laboratory test device for rapid, easy and accurate measurement of the surface electrical resistivity of concrete based on the four-probe (Wenner-Array) technique. The Surf™ patented technology automatically measures resistivity around the concrete specimen using four channels of 4-probe array (located at 90° from each other). The PC software generates the required reports according to the standard specifications.

Surf™ can be used to determine the chloride permeability of concrete in accordance with AASHTO TP95 and the upcoming ASTM standard. The measurement data can be used for durability-based quality control of concrete as well as the service life design of concrete structures


The electrical resistivity of concrete is correlated well with important durability parameters such as permeability, diffusivity and in general the micro-structure characteristics of concrete. It is a fast and easy method of quality control during new construction.
Surf™ is a unique device for automatic 4-channel resistivity measurement suitable for investigating the micro-structural properties of concrete including:

  • Durability-based quality control of concrete
  • Diffusion of chloride in concrete
  • Setting time of fresh concrete
  • Crack detection in concrete
  • Water content in fresh concrete


  • Patented technology
  • The only device in the market fully compliant with both AASHTO T95 and the upcoming ASTM standard
  • Easy to use (see demo on Youtube)
  • Variable frequency (13 – 100 Hz)
  • Wide resistivity range (0.1 – 1,000 kΩ.cm)
  • Fast measurement (8 measurements < 15s)
  • Four-channel four-probe measurement
  • Limiting moisture loss
  • Automatic report generation with PC software
  • Fresh concrete testing/crack detection applications
  • Continuous measurement mode
  • USB connection to computer


Reading range

Frequency range



13 – 100 Hz

± (0.1+1%)


13 – 100 Hz

± (1+1%)


Measurement Time


Single measurement time

Testing time (8 measurements)

13-100 Hz

1.5 seconds

<15 seconds


Operating conditions



Operating temperature

15 ~ 45 °C

Operating humidity

30 ~ 80%

Storage temperature

0 ~ 60°C

Operating voltage/ current

100-250 V ± 10%, 60Hz

Dimensions of Surf™

200 x 160 x 70 mm