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Home  >>  Products  >>  pH & Conductivity  >>  Resipod Family

Resipod Family Portable Resistivity Meter


Resipod is a fully integrated 4-point Wenner probe, designed to measure the electrical resistivity of concrete in a completely non-destructive test.

It is the most accurate instrument available, extremely fast and stable and packaged in a robust, waterproof housing designed to operate in a demanding site environment.




  • Fully integrated surface resistivity instrument
  • Wide measuring range (0 to ca. 1000 kΩcm)
  • Fast and accurate delivery of measuring results
  • Highest resolution available for a surface resistivity instrument
  • Meets the AASHTO standard (38mm, 1.5” probe spacing) (standard under development)
  • Current flow indication and poor contact indication
  • Hold, save and delete function, with onboard memory
  • USB connection and dedicated PC software
  • Designed to float (waterproof according to IPX7
  • Allows variable probe spacing to be set
  • Allows replacement of standard tips with accessories

Surface resistivity measurement provides extremely useful information about the state of a concrete structure. Not only has it been proven to be directly linked to the likelihood of corrosion and the corrosion rate, recent studies have shown that there is a direct correlation between resistivity and chloride diffusion rate.

The versatility of the method can be seen in these example applications: Estimation of the likelihood of corrosion, Indication of corrosion rate, Correlation to chloride permeability, On site assessment of curing efficiency, Determination of zonal requirements for cathodic protection systems, Identification of wet and dry areas in a concrete structure, Indication of variations in the water/cement ratios within a concrete structure, Identification of areas within a structure most susceptible to chloride penetration and Correlation to water permeability of rock


Technical Data

Technical Data
Range: 0 - ca. 1000 kΩcm (depending on probe spacing)
Resolution: (nominal current 200μA) ±0.2 kΩcm or ±1% (whichever is greater)
Resolution: (nominal current 50μA) ±0.3 kΩcm or ±2% (whichever is greater)
Resolution: (nominal current <50μA) ±2 kΩcm or ±5% (whichever is greater)
Frequency: 40 Hz
Memory: Non volatile, ca. 500 measured values
Power Supply: >50 hours autonomy
Charger Connection: USB type B, (5V, 100mA)
Dimensions: 7.8 x 2.1 x 2.7 inch (197 x 53 x 69.7 mm)
Weight: 11.2 oz (318 g)
Operating Temperature: 32° to 122°F (0° to 50°C)
Storage Temperature: 14° to 158°F (-10° to 70°C)


The Measurement Principle


The Measurement Principle

Operating on the principle of the Wenner probe, the Resipod is designed to measure the electrical resistivity of concrete or rock.

A current is applied to the two outer probes and the potential difference is measured between the two inner probes. The current is carried by ions in the pore liquid. The calculated resistivity depends on the spacing of the probes.

Resistivity ρ = 2πaV/l [kΩcm]


Resipod Models and Probe Spacing

Resipod Models Probe Spacing
A wider probe spacing provides a more consistent reading when measuring on an inhomogeneous material like concrete. However, if the spacing is too wide, there is more danger of the measurement being affected by the reinforcement steel. The industry standard 50 mm probe spacing has long been seen as a good compromise.
The 38mm (1.5”) model is designed specifically to comply with the AASHTO standard (under development) for “Surface Resistivity Indication of Concrete’s Ability to Resist Chloride Ion Penetration”. The Surface Resistivity (SR) test is a much quicker and easier test for estimating concrete permeability. It is a proven and mature test method which can replace the more laborious rapid chloride permeability test.


Indication of Poor Connection

A good connection between the instrument and the concrete surface is the most important factor for obtaining a reliable measurement. Resipod automatically detects a poor connection and alerts the user.
Indication of Poor Connection
  No contact inner probes overflow "open line" indication  


ResipodLink Software


The collected measurement values can be analyzed comfortably with the Resipod Link PC tool.

System requirements: Windows XP, Windows Vista, Windows 7, USB-Connector. An internet connection is necessary for software and firmware (using PqUpgrade) updates if available.

ResipodLink Software


Resipod Surface Resistivity (SR) Method


In 2011 the American Association of State Highway and Transportation Officials (AASHTO) became the first standards body to define permeability classes based on reisistivity measurements (TP95-11 Standard Method of Test for Surface Resistivity Indication of Concrete's Ability to Resist Chloride Ion Penetration).

Since that time this test has established itself as a simple, economical alternative to the ASTM C 1202 Rapid Chloride Permeability test with several clear advantages:

  • Much faster to perform
  • No sample preparation necessary
  • Test can be repeated at different ages e.g. 38 days, 56 days
  • The sample cylinder can be used for compressive strength testing

Resipod on Concrete

Resipod with 1.5" (38mm) probe spacing is fully compliantwith the above mentioned standard


Application Overview

Application Overview
Application Resipod Resipod Geometric Resipod Bulk Resistivity
Surface resistivity test on standard cylinders (4" x 8", 100 x 200mm or 6" x 12", 150 x 300mm) with a maximum aggregate size of 1.5", 38mm Fixed probe spacing (1.5", 38mm)
Bulk resistivity test on cylinders up to 100mm (4") diameter    
Surface resistivity test on non-standard cylinders with aggregate sizes that may exceed >1.5", 38mm    
Correction factor for probe spacing
Correction factor for sample geometry    
User definable correction factor    
Variable probe spacing    
Surface resistivity mapping on site for: estimation of likelihood of corrosion, corrosion rate and implementation of cathodic protection systems  


Resipod Geometric (SR) Method


The AASHTO TP-95-11 standard is limited to particular sample geometries and a maximum aggregate size of 1.5", 38mm. Resipod Geometric is designed to comply with the latest research intended to extend the current limits of this AASHTO standard.

Resipod Geometric is supplied with a variable spacing probe that can accommodate larger aggregate sizes. It also allows the user to enter geometric correction factors via the ResipodLink software to give the correct resistivity reading directly on the instrument.

Resipod Geometric


Resipod Bulk Resistivity (BR) Method


The Bulk Resistivity test is an alternative method where the sample resistivity is measured between electrical plates placed at either end of the sample. The geometry factor is very simple and the test is rapid to perform, with similar advantages as the surface resistivity test.

The Resipod Bulk Resistivity kit provides everything necessary for carrying out this test on standard 4", 100mm diameter cylinders.

Resipod Bulk


Warranty Information


Standard Warranty:

  • Electronic portion of the instrument: 24 months
  • Mechanical portion of the instrument: 6 months
  • Wear and tear in case of a defect condition, the buyer can return the item for evaluation within 30 days of shipment to the buyer

Extended Warranty:

  • An extended warranty for 1, 2 or 3 years for the Resipod can be purchased at the time of order or within 90 days thereafter.



Prices subject to change    Prices listed in US dollars for domestic shipments within US, Canada, & Mexico only    Export orders require quotations - click here for a quote     For more info call us 1-800-762-2478 or 954-946-9454.
Item Number Item Prices

Resipod 50mm Probe Spacing - Resipod, 50mm probe spacing, test strip, foam contact pads, charger with USB-cable, software, carrying strap, documentation and case

Resipod 38mm Probe Spacing - Resipod, 38mm (1.5") probe spacing, test strip, foam contact pads, charger with USB-cable, software, carrying strap, documentation and case

Resipod Bulk 50mm Probe Spacing - Resipod Bulk, bulk accessory, 50mm probe spacing, test strip, foam contact pads, charger with USB-cable, software, carrying strap, documentation and case

Resipod Bulk 38mm Probe Spacing - Resipod Bulk, bulk accessory, 38mm (1.5") probe spacing, test strip, foam contact pads, charger with USB-cable, software, carrying strap, documentation and case

Resipod Geometric 50mm Probe Spacing - Resipod Geometric, geometric accessory, 50mm probe spacing, test strip, foam contact pads, charger with USB-cable, software, carrying strap, documentation and case

Resipod Geometric 38mm Probe Spacing - Resipod Geometric, geometric accessory, 38mm (1.5") probe spacing, test strip, foam contact pads, charger with USB-cable, software, carrying strap, documentation and case

CD-831003 Resipod, 50mm probe spacing $3,435.00
CD-831015 Resipod, 38mm probe spacing 3,435.00
CD-831005 Resipod Bulk, 50mm probe spacing 4,537.00
CD-831007 Resipod Bulk, 38mm probe spacing 4,537.00
CD-831009 Resipod Geometric, 50mm probe spacing 5,212.00
CD-831011 Resipod Geometric, 38mm probe spacing 5,212.00
CD-831016 Bulk Resistivity Accessory 1,102.00
CD-831017 Resipod Geometric Accessory 1,792.00
CD-831019 Variable spacing probe with extension cable set 1,411.00
CD-831021 Resipod stand 374.00
CD-831025 Set of replacement foam contact pads (20 pieces) 125.00
CD-831026 Bulk resistivity contact pad (10 pieces) 30.00
CD-831027 Test strip 49.00
CD-831033 USB cover 55.00
CD-831037 USB charger, global 78.00
CD-831039 USB cable, 1.8 m long 23.00
CD-831041 Key for USB port 56.00
CD-831043 Inner contact cap 43.00
CD-831045 Outer contact cap 43.00
CD-831049 Contact spring 12.00
CD-831053 Resipod 1-year extended warranty 350.00
CD-831055 Resipod 2-year extended warranty 658.00
CD-831057 Resipod 3-year extended warranty 966.00


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