Concrete Surface Resistivity
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

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.
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 concreteDiffusion of chloride in concreteSetting time of fresh concreteCrack detection in concreteWater content in fresh concrete
Patented technologyThe only device in the market fully compliant with both AASHTO T95 and the upcoming ASTM standardEasy 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 measurementLimiting moisture lossAutomatic report generation with PC softwareFresh concrete testing/crack detection applicationsContinuous measurement modeUSB connection to computer