Materials Testing
    Laboratory device for measuring the surface electrical resistivity of concrete

Laboratory device for measuring the surface electrical resistivity of concrete


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Rapid, Easy, & Accurate Measurements

Surf is a laboratory device for testing the surface electrical resistivity of concrete based on the four-probe (Wenner-Array) technique. These measurements are used to estimate the resistance of chloride penetration in the concrete. This shows the qualitative relationship between the rapid chloride penetrability test (RCPT) and the surface electrical resistivity of concrete. This surface resistivity meter can also be used for durability-based quality control of concrete and for monitoring the service life design of a structure.


  • Performance-based quality control of concrete
  • Estimation of chloride diffusion of concrete
  • Service life design of concrete structures
  • Crack detection in concrete
  • Water content of fresh concrete

Four Measurement Channels 

Automatically measure resistivity around the concrete specimen using four channels of 4-probe array, located at 90° from each other.

Fast & Accurate Data

As an alternative to the RCPT test, electrical resistivity evaluates the quality and durability of hardened concrete in minutes.

Automatic Report Generation

Easily export and share reports on concrete durability and service-life with project partners and stakeholders.


  • Optional hand-held probe
  • Fast measurements (8 measurements < 15s)
  • Four-channel four-probe surface resistivity meter


  • Accurate data (±2%)
  • Variable frequency (13 – 100 Hz)
  • Automatic report generation
  • Free user-friendly PC software
Single Measurement Time 1.5 seconds
Testing Time (8 measurements)
Measurement Channels 4
Frequency 13 – 100 Hz

Reading Range

Reading Range Frequency range Accuracy
0.1 – 100 KΩ.cm13 – 100 Hz ± (0.1+1%)
100 – 1000 KΩ.cm13 – 100 Hz± (1+1%)