Conductivity probes for your measurement needs

Conductivity probes for your measurement needs

A wide range of conductivity cells are available for every application. These conductivity cells feature built-in temperature compensation; high, standard, and low conductivity measuring ranges; cell constants from 0.1 to 10cm -1 and a variety of probe materials including epoxy/graphite, glass/platinum, and stainless steel.

Quick links:

Featured electrodes:

View all
  Rugged DuraProbe 4-electrode conductivity cell 2-electrode conductivity cell for ultra-pure water High range
2-electrode conductivity cell
Chemical resistant
3-electrode conductivity cell
  Orion DuraProbe 
4-Electrode Conductivity Cells
Orion 2-Electrode Conductivity Cells Orion 2-Electrode Conductivity Cells Orion 3-Electrode Conductivity Cell
  • Widest conductivity range
  • For lab and field applications
  • Rugged epoxy/ graphite body
  • Cable lengths from 1.5 to 10 meters
  • Low conductivity range
  • For ultra pure water applications
  • Includes detachable glass flow cell
  • High conductivity range
  • For lab applications
  • Chemical resistant glass body
  • Flow through or dip cell
  • Rugged epoxy/ stainless steel
  • Removable guard
Product SKU number 013005MD A

013016MD A

018020MD A *

014005 H **

Measurement range 1μS/cm to 200mS/cm 0.01μS/cm to 300μS/cm 10μS/cm to 2000mS/cm 0μS/cm to 200μS/cm
Approximate Cell Constant 0.475cm-1 0.1cm-1 10cm-1 1.0cm-1
Cell Material Epoxy/graphite Steel, V4A Glass/ platinum, platinized Epoxy/steel
Connector MiniDIN connector (Star) MiniDIN connector (Star) MiniDIN connector (Star) BNC and 2.5 mm Phono Jack connector (Russell)
Meter Compatibility Star Series Star Series Star Series RL060C Russell
(D) Dia
(L) Length
(V) Flow cell volume
15mm (D),
120mm (L)

13mm (D), 
120mm (L),
8-12mL (V)

16mm (D),
115mm (L)

13mm (D),
120mm (L)
Min/Max Immersion Depth 35/NAmm 35/110mm 55/110mm 25/120mm
Key information
 A MiniDIN connector (Star)   B 8 Pin DIN oonnector (A+ Series)
 F 8 Pin Waterproof DIN connector (A Series)
 H BNC and 2.5 mm Phono Jack oonnector (Russell)
 *Conductivity cell does not have temperature compensation
 **3 -Bectrode ConductMty Cell

  Increase your productivity with conductivity probe accessories

Featured accessory


Protective probe guard

Provide additional protection and weight for conductivity cells and DO probes with Thermo Scientific Orion Protective Guards for Conductivity Cells and Dissolved Oxygen Probes. Use the all-stainless-steel guard when optimum protection and weight are required. Combine the stainless steel cap and plastic sleeve when weight is needed for submersion and standard protection is needed. Or, when minimal weight and protection are required, use the all-plastic guard.
Increase your productivity with our conductivity probe accessories ›

Thermo Scientific Orion conductivity cells


Electrical conductivity is an inherent property of most materials and ranges from extremely conductive materials, such as metals, to non-conductive materials, like plastic or glass. In between the two extremes are aqueous solutions, such as sea water and plating baths. In metals, the electrical current is carried by electrons while in water it is carried by charged ions. In both cases, the conductivity is determined by the number of charge carriers, how fast they move, and the capacity of the carrier. Thus for most water solutions, the higher the ion concentration from dissolved salts, generally the higher the conductivity. Conductivity will increase with an increase in ion concentration until the solution becomes too crowded, thus restricting the freedom of the ions to move. Thereafter, conductivity may actually decrease with increasing ion concentration. This can result in two different concentrations of a salt having the same conductivity.

Conductance is defined as the reciprocal of resistance and is measured in Siemens (S), which was formerly referred to as mho (ohm spelled backwards). Conductivity is an inherent property of any given solution and is derived from conductance by the geometry of the measuring cell. A measurement results in the conductance of the sample and it is converted to conductivity. This is done by determining the cell constant (K) for each setup using a known conductivity standard solution.

Conductivity = (Cell conductance X Cell constant)

The Cell is comprised of 2 flat parallel measuring electrodes separated a fixed distance (d). The Cell constant (K) is related to the physical characteristics of the measuring cell and is a function of the separation distance (d) divided by the electrode area (a). In practice, the measured cell constant is a fixed value and is entered into the meter whereby the conversion from conductance to conductivity is calculated and presented.


Conductivity meters measure the ion capacity in aqueous solution to carry electrical current. As the ranges in aqueous solutions are usually small, the basic units of measurements are milliSiemens/cm (mS/cm) and microSiemens/cm (μS/cm). Conductivity is used widely to determine the level of impurities in water supplies for domestic consumption as well as industrial use. Industries that employ this method include the chemical, semi-conductor, power generation, hospitals, textile, iron and steel, food and beverage, mining, electroplating, pulp and paper, petroleum and marine industries. Specific applications include chemical streams, demineralizer output, reverse osmosis, stream boilers, condensate return, waste streams, boiler blowdown, cooling towers, desalinization, laboratory analysis, fruit peeling and salinity level detection in oceanography. In the table below are examples of solutions and their known conductivities.



Absolute pure water  0.055μS/cm
Power plant boiler water 1.0μS/cm
Good city water  50μS/cm
Ocean water  53mS/cm
Distilled water  0.5μS/cm
Deionised water  0.1 - 10μS/cm
Demineralised water  0 - 80μS/cm
Drinking water  0.5 - 1mS/cm
Wastewater  0.9 - 9mS/cm
Seawater  53mS/cm
10% NaOH 
10% H2SO4 
31% HNO3 
* mS/cm = milliSiemen per centimeter
  uS/cm  = microSiemen per centimeter

What are the benefits of 2-electrode cells and 4-electrode cells?

2-Electrode Conductivity Cells DuraProbe 4-Electrode Conductivity Cells 

The 2-electrode cells are able to measure low, standard, and high conductivity samples, depending on the cell constant. Cells with a 0.1cm-1 cell constant are ideal for low ionic strength solutions, deionized water, and ultra pure water. Glass/platinum cells are the best for chemically reactive conductivity samples, since the cell material is highly chemical resistant.

DuraProbe 4-electrode cells provide the highest accuracy for demanding laboratory or field applications. The 4-electrode design compensates for electrode fouling, cable and connector resistance, polarization errors, and fringe field interference errors. The epoxy/graphite cell material is extremely durable and chemically resistant. DuraProbe conductivity cells are ideal for high and standard conductivity samples and difficult samples such as wastewater, runoff water, and mud.

The stainless steel body 2-cell is perhaps our top seller All have durable epoxy bodies
The stainless steel cell is best for ultra pure water measurements No error from cable resistance, allowing for longer cable lengths
Multiple cell materials available - graphite, platinum or stainless steel Minimum effect on accuracy from electrode polarization and contamination
Different cells designed to measure multiple specific ranges Wide measurement range
Option for flow cell or flow-through design Unaffected by deposits on cell surface
Dry cell storage is an added benefit of these conductivity probes


benchtop conductivity measurement

The accuracy and reliability of your conductivity measurements depends on the instrumentation you use. Learn more about how you can identify the best match based on your required features, performance, specifications, and budget.

Learn more  


portable conductivity measurement

Our portable meters are rugged and waterproof, and provide dependable performance in the field without sacrificing accuracy and reliability.


Learn more  


standards and solutions for conductivity measurement

We offer conductivity standards, TDS standards, and conductivity probe conditioning solutions for your conductivity measurement needs. Find the standards and solutions that you need for your process.

Learn more 


Measuring the Conductivity of Pure Water Using USP <645>

Measuring the Conductivity of Pure Water Using
USP <645>

This application note describes the three stages of USP<645> water conductivity testing. Includes sections on cell constraint calibration, meter calibration verification, and helpful measuring hints.


measuring conductivity in liquids

What are the top mistakes when measuring conductivity in liquids?

Although conductivity measurements are generally simple and easy to take, mistakes can still affect the validity of the data generated. Download this informative Smart Note to learn more.



Knowledge Base: Certificates of Analysis and SDS for Orion, ROSS, AQUAfast, AquaMate, and AquaSensors products.

Orion Meters Software and Upgrades
Thermo Scientific Orion benchtop and portable meters are designed to help deliver accurate, consistent results, day after day. Boost productivity by upgrading your software today.

Find your software