TNS02 efficiently and accurately performs on-site (field) as well as laboratory measurements of the thermal conductivity and thermal resistivity of soils. The system is a combination of our FTN02 and MTN02 systems. Measurement with TNS02 complies with ASTM D5334 and IEEE 442 standards. It is designed for optimal flexibility. TNS02 includes two different needles; one on a short insertion tool for use in the laboratory, the other mounted on a long lance for use on-site. The control and readout unit, CRU02, is shared between the two (on-site and laboratory) needle models.

  • Efficient and accurate measurement of thermal conductivity and resistivity of soils
  • Measurements both in the field and in laboratory environments


TNS02 essentially consists of a combination of FTN02 and MTN02 components: the insertion tool IT03 and needle TP07 of MTN02 are added to FTN02.

TNS02 Component Chart

Suggested Use

  • Route surveys, on-site (field) measurements
  • Laboratory analysis of soil specimens

Areas of Application


Measurand Temperature, Thermal Conductivity, Thermal Resistivity
Measurement range 0.1 to 6 W/(m·K) (all common soils)
Rated operating temperature range 0 to + 50 °C
Measurement method Absolute measurement per ASTM D 5334-08 and IEEE 442-1981 (03)
Further specifications See FTN02 and MTN02

Frequently asked questions

How do I choose the right instrument for measuring thermal properties?

Hukseflux offers a wide range of products for material characterization and measurement of thermal conductivity.

We can offer assistance in choosing the right instrument. But first, you should ask yourself the following questions:

  • what material should be analyzed?
  • what are the conditions, for instance concerning temperature and pressure?
  • what specimens are available?
  • are there standards for my application?
  • what level of accuracy do I need?

Hukseflux is a leading manufacturer of thermal conductivity measuring systems and sensors. We have prepared a guide which may assist you in choosing the proper instrument for measuring thermal properties of your material, whether it is soil, plastics, paints, composites, pastes and fluids.

Hukseflux is able to offer highest quality products at an acceptable price level. If we cannot offer you an acceptable solution ourselves, we will tell you who can. Please contact us for further assistance.

Where are the sensors (needle, probe, meter) for measuring thermal conductivity?

Hukseflux sells a range of complete measuring systems including sensors and Measurement and Control Units (MCU). We offer systems and needle type thermal properties sensors for use in the field and for use in laboratory environments.

These thermal properties sensors, TP02 and TP08, are also available as separate probes for use with the user’s own electronics, for instance Campbell Scientific CR1000.

Cannot find what you are looking for? Please contact us.

Can I get training or a rental system for the thermal conductivity measuring instrument of my choice?

Expert training for system operators
Although in general the systems can be operated by following manuals and standards, we can provide you with expert training. Training vastly improves the level of service to the third party, the efficiency of working with the equipment and reduces the uncertainty of the end result.

Equipment rental
Unfortunately we have discontinued our rental services for all systems.