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Product Code T2001A3
Price $2,500 ex. VAT

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Quick and accurate characterisation for a wide range of materials

Experience effortless sheet resistance measurements with the system's easy-to-use PC software

Part of the Institute of Physics award-winning Ossila Solar Cell Prototyping Platform, the Ossila Four-Point Probe System is an easy-to-use tool for the rapid measurement of sheet resistance, resistivity, and conductivity of materials.

Built with a high-specification Ossila Source Measure Unit at its core, the Ossila Four-Point Probe is a low-cost system that allows a wide measurement range. The probe head uses spring-loaded contacts instead of sharp needles, preventing damage to delicate samples, such as polymer films with thicknesses on the order of nanometres. The price includes a four-point probe, in-built source measure unit, easy-to-use PC software, and an ITO-coated glass substrate. With free tracked worldwide shipping as standard, more laboratories across the globe can now measure sheet resistance to empower their materials characterisation and thin-film development programs.

The Ossila Four-Point Probe is now supplied with a global power cord that supports all major plug types (type G, type F, type A and type I). Please contact us for more information.

Two-Year Warranty

Two-Year Warranty

Covered by the Ossila Warranty

Compact Source Measure Unit

Free Software

Keeping your software up to date

Current Range

Current Range

Characterisation of a wide range of materials

Easy to use

Easy to Use

A simple and intuitive interface

Key Features

Wide Current Range

Wide Current Range

The four-point probe is capable of delivering currents between 1 μA and 200 mA, and can measure voltages from as low as 100 μV up to 10 V. The system can measure sheet resistances in the range of 100 mΩ/□ to 10 MΩ/□, enabling the characterisation of a wide range of materials.



Just plug in the system, install the software, and you're ready to go! The intuitive interface and clean design makes the four-point probe easy-to-use, simplifying the measurement of sheet resistance. Substrates of various shapes and sizes can be used.

High Accuracy

High Accuracy

Positive and negative polarity measurements can be performed using the PC software. This enables you to calculate the average sheet resistance between positive and negative currents — eliminating any voltage offsets that may have occurred, hence increasing the accuracy of your measurements.

Non-Destructive Testing

Non-Destructive Testing

Designed with the measurement of delicate samples in mind, the four-point probe head utilises gold-plated, gentle spring-loaded contacts with rounded tips. This results in a constant contact force of 60 grams, preventing the probes from piercing fragile thin films, whilst still providing good electrical contact.

Space-Saving Design

Space-Saving Design

Through careful design consideration, we have been able to keep the footprint of the four-point probe to a minimum (total bench area of 14.5 cm x 24 cm), allowing it to be used even in busy labs where shelf space is limited.

Rapid Material Characterisation

Rapid Material Characterisation

The PC software (included with the system) performs all the necessary measurements and calculations for sheet resistance, resistivity, and conductivity — making material characterisation effortless. It also automatically performs correction factor calculation.

Four-Point Probe System labelled diagram

Equipped with Soft Contact Probes

The Ossila Four-Point Probe System reduces the potential of damaging delicate thin films via three features. The probes, used to make contact, have rounded tips (unlike other probes which are like sharp needles). These rounded tips have a radius of 0.24 mm and give the probes a larger contact surface area than a needle would, therefore spreading out the downward force being applied to the sample. These probes are gold plated and mounted on springs to encourage electrical contact without excessive force as it enables them to retract into the probe head when making contact with the sample to ensure that a uniform force of 60 grams is applied. A schematic of the probes is shown in the figure below. The probe head can be purchased separately here.

Schematic diagram of the probes used by the Four-Point Probe system
Schematic diagram of the probes used by the Four-Point Probe System.

Please note, this system is not suitable for silicon or other materials which naturally form insulating oxide layers. To measure such materials, the oxide layer needs to be penetrated by the probes, which may not be possible with the spring-loaded, round tipped probes utilised by this system.

Included with the Ossila Four-Point Probe

The Four-Point Probe Unit

Built-in Ossila Source Measure Unit

Built-in Ossila Source Measure Unit

The Ossila Four-Point Probe is powered by our Source Measure Unit. Supplied with a 24 V / 2 A power adapter and USB-B cable.

For more information, please refer to the Source Measure Unit product page.

Four-point probe head

Four-point probe head

Providing a constant contact force of 60 grams, the spring-loaded four point probe head is perfect for delicate samples. The probes are gold-plated to ensure good electrical contact is made without excess force, and are rounded to further prevent them from causing damage to thin films and other fragile samples (note that they are not suitable for silicon or other materials with insulating oxide layers).

Linear translation stage

Linear translation stage

With micrometer height control and a sample stage with non-slip rubber.

Software and Accessories

Ossila Four-Point Probe Software

Ossila Four-Point Probe Software

The Ossila Sheet Resistance Lite software is quick, simple and easy to use. Accurate results are assured by the automatic geometrical correction factors, and the software is able to calcuate the resistivity and conductivity of the sample on the fly for quick characterisation of materials.

The software is supplied on the included USB memory stick along with a copy of the user manual and QC data. In addition, the latest version is always available to download for free from our website.

ITO-coated glass substrate

ITO-coated glass substrate

100 nm ITO coated glass substrate (20 x 15 mm).

Also available seperately. Please refer to the ITO-coated glass substrate product page for more information.

Resources and Support

Calculate Sheet Resistance Using the Four-Probe Method Calculate Sheet Resistance Using the Four-Probe Method

This guide explains the theory behind sheet resistance, an electrical property of thin films of materials, and demonstrates how the four-probe method can be used to measure it.

How to Measure Sheet Resistance using a Four-Point Probe How to Measure Sheet Resistance using a Four-Point Probe

This guide gives an overview of how to use the Ossila Four-Point Probe System, as well as some general tips and tricks for measuring sheet resistance.

Xtralien Scientific Python (Legacy) Xtralien Scientific Python (Legacy)

The Xtralien Scientific Python distribution is a development environment aimed at scientists and includes all the relevant tools and libraries that a scientist will need to get started.

Making OLED and OPV solar cells: Quickstart Guide Making OLED and OPV solar cells: Quickstart Guide

Organic photovoltaic cells (OPVs) or organic light emitting diodes (OLEDs) can be easily manufactured using Ossila’s pre-patterned ITO substrates and a few simple spin coating and evaporating steps.

Ossila Four-Point Probe User Manual Ossila Four-Point Probe User Manual

The Ossila Four-Point Probe System is a low-cost solution for rapid and reliable measurement of the sheet resistance, resistivity and conductivity of materials.

Software and Drivers Software and Drivers

The latest software and drivers including our cyclic voltammetry software for the Ossila Potentiostat and more.


Four-Point Probe Measurement Specifications

Voltage Range ±100 μV to ±10 V
Current Range ±1 μA to ±200 mA (5 ranges)
Sheet Resistance Range 100 mΩ/□ to 10 MΩ/□ (ohms per square)


Sheet Resistance Accuracy* Precision** Measured at Range
100 mΩ/□ ±8% ±3% 200 mA
1 Ω/□ ±2% ±0.5% 200 mA
10 Ω/□ ±1% ±0.5% 200 mA
100 Ω/□ ±1% ±0.05% 20 mA
1 kΩ/□ ±1% ±0.03% 20 mA
10 kΩ/□ ±1% ±0.02% 2000 µA
100 kΩ/□ ±2% ±0.05% 200 µA
1 MΩ/□ ±8% ±0.5% 20 µA
10 MΩ/□ ±30% ±5% 20 µA

*Accuracy is the maximum deviation from the true value.

** Precision is the maximum deviation between identical measurements (useful for comparative measurements).

Physical Device Specifications

Probe Spacing 1.27 mm (0.05")
Rectangular Sample Size Range

Long Edge Minimum: 5 mm (0.20")

Short Edge Maximum: 60 mm (2.36")

Circular Sample Size Range (Diameter) 5 mm to 76.2 mm (0.20" x 3.00")
Maximum Sample Thickness 10 mm (0.39")
Overall Dimensions (W x H x D) 145 mm x 150 mm x 240 mm (5.71" x 5.91" x 9.45")
Four-point probe close up
Close up of the four point probe

Resistivity and Conductivity Range

As the system measures the sheet resistance of a sample, a general range of measurable resistivities or conductivities cannot be given. This is because the measurable resistivity range depends on the thickness of the sample being tested. The resistivity of a sample can be calculated from its sheet resistance and thickness using the following equation:

Sheet resistance resistivity equation

The system is capable of measuring between 100 mΩ/□ and 10 MΩ/□, so if we use these values in the formula above with a sample 50 nm thick, then the resistivity (conductivity) range that can be measured by the system will be 5 nΩ.m to 500 mΩ.m (2 S/m to 200 MS/m). If the sample is 400 µm thick, then the resistivity (conductivity) range of the system is 40 µΩ.m to 4 kΩ.m (250 µS/m to 25 kS/m). Below is a table of the resistivity and conductivity ranges of the system for samples with thicknesses of different orders of magnitude:

Sample Thickness Resistivity Range Conductivity Range
10 nm 1 nΩ.m – 100 mΩ.m 10 S/m – 1 GS/m
100 nm 10 nΩ.m – 1 Ω.m 1 S/m – 100 MS/m
1 µm 100 nΩ.m – 10 Ω.m 100 mS/m – 10 MS/m
10 µm 1 µΩ.m – 100 Ω.m 10 mS/m – 1 MS/m
100 µm 10 µΩ.m – 1 kΩ.m 1 mS/m – 100 kS/m
1 mm 100 µΩ.m – 10 kΩ.m 100 µS/m – 10 kS/m

An intuitive and user-friendly standalone PC program is used to control the four-point probe measurement, enabling rapid characterisation of materials without the need for the user to write any code themselves. This PC software calculates appropriate geometrical correction factors for the given sample geometry, ensuring accurate results. It can also calculate the resistivity and conductivity of the sample, if the thickness is provided, to allow for extensive electrical characterisation of materials.

Sheet Resistance Lite Software
Sheet Resistance Lite Measurement Software
Four-point probe measurement of an ITO substrate
Four-point probe measurement of a 100 nm ITO film (S111)

The software saves data to comma-separated value (.csv) files, facilitating importing the data into your preferred analysis software. Advanced settings give you greater control over the measurment, allowing you to set voltage and current limits, perform negative polarity measurements, or use probes with different spacings.

Key Software Features

  • Clean and intuitively-designed interface
  • Data saved to .csv file
  • Calculates resistivity and conductivity for samples with a known thickness
  • Automatic correction factor calculation

Software Requirements

Operating System Windows 10 (32-bit or 64-bit)
CPU Dual Core 2 GHz
Available Hard Drive Space 178 MB
Monitor Resolution 1440 x 900
Connectivity USB 2.0, or Ethernet (requires DHCP)

The Ossila Four-Point Probe comes with everything you need, including a power adapter, a USB-B cable, a 400 – 450 nm FTO coated glass substrate (60 mm x 60 mm x 2.2 mm), a 10 kΩ resistor test head, and a USB memory stick pre-loaded with the user manual, software installer, QC data, and USB drivers. Spare probe heads can be bought seperately.

Four-Point Probe Spares and Accessories


Related Processing Equipment

To the best of our knowledge the information provided here is accurate. The values provided are typical at the time of manufacture and may vary over time and from batch to batch. Products may have minor cosmetic differences (e.g. to the branding) compared to the photos on our website. All products are for laboratory and research and development use only.

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