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Calibration of thermodynamic measurands

Calibration of simple temperature and humidity measuring instruments through to highly accurate reference standards - the thermodynamic laboratory of Testo Industrial Services calibrates at standard points and fixed points of the ITS-90.

Thermodynamics is a branch of physics and deals with the laws of heat, volume, pressure and temperature and their relationship to energy and work. The measurement of thermodynamic parameters plays a quality assurance role in almost every industrial sector.

Testo Industrial Services is the expert for the calibration of thermodynamic measuring instruments. Our thermodynamic laboratory is characterized not only by the lowest measurement uncertainties but also by a comprehensive portfolio for the calibration of the measurands temperature and humidity.

Your advantage: Our competence

  • Wide measuring ranges with lowest measurement uncertainties
  • Primary humidity generator for smallest measurement uncertainties in Europe
  • Calibration of reference standards and fixed point cells in our primary laboratory

Our novelties

  • Humidity generator
  • Extended accredited calibration range for block calibrators

Insight into our thermodynamic laboratory

Our thermodynamic laboratory is characterized not only by the lowest measurement uncertainties, but also by a comprehensive portfolio for the calibration of the measurands temperature and humidity. Convince yourself of our extensive service portfolio

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The measurement of temperature plays a decisive role in almost every industry. Therefore, the calibration of the temperature measuring devices used, such as data loggers, thermal imaging cameras, immersion sensors, thermocouples, etc., is essential.

At Testo Industrial Services, you can select the appropriate calibration points for your measuring instrument, individually according to your quality requirements. With the lowest measurement uncertainties, we calibrate in a range from -196 ˚C to 1200 ˚C. All electronic temperature measuring instruments, resistance thermometers and thermocouples are calibrated in the liquid basin or in the tube furnace with a sodium heat pipe as well as in our modern temperature cabinets.

For this purpose, we are DAkkS accredited for a large part of the measurement procedures according to DIN EN ISO/IEC 17025:2018.



Kalibrierung von Temperaturmessgeräten im Tauchbecken

In the field of temperature we are specialized in the following measuring instruments:

  • Glass thermometer
  • Data logger, measuring transducer
  • PT100, thermocouple, NTC
  • Air and immersion sensors

Surface temperature

In addition to the classic temperature measuring devices, measuring devices are used in companies to check the surface temperature. Testo Industrial Services as an accredited calibration laboratory has the competence to calibrate surface temperature probes and sensors by contact or non-contact. The accredited calibration facility of Testo Industrial Services sets new standards in the calibration of surface sensors.

In the field of contact surface measurement, we calibrate cross band probes, mushroom cap probes or other special probe designs. Unique here is the accredited calibration according to DIN EN ISO/IEC 17025:2018.

Non-contact surface temperature measurements are carried out during the calibration of thermal imaging cameras and pyrometers, for example. We have several black liquid emitters for this purpose and are accredited in the range from -18°C to 350°C.

Kalibrierung im Bereich der Oberflächentemperatur


In the field of surface temperature we are specialized in the following measuring instruments:

  • Thermal imaging cameras
  • Infrared measuring devices
  • Pyrometer
  • Surface temperature sensor

Temperature calibrators and calibration baths

Temperature calibrators and calibration baths are electronic controllers that automatically and quickly provide a temperature. This enables independent calibrations and quick checks of all types of temperature measuring devices. Testo Industrial Services offers you the calibration of your calibrators in the laboratory or directly on your premises.

We offer calibrations for block calibrators in a measuring range from -100 to 1.000 °C. Accredited calibrations are carried out from -90 to 1.000 °C in accordance with DKD-R 5-4. The calibration can be carried out in a loaded or unloaded state. 

For the calibration of your calibration baths, you can freely select the measuring points for an accredited calibration in a measuring range from -80 to 300 °C. For ISO/factory calibration, we offer you a calibration range from -100 to 1.000 °C with smallest measurement uncertainties.

Calibration of calibration baths and block calibrators with a reference sensor

In the field of temperature calibrators and calibration baths, we specialize in the following measuring instruments:

  • Block calibrators
  • Calibration/temperature baths
  • Circulation/overflow thermostats


The precise calibration of moisture meters requires the highest level of metrological expertise. The accredited humidity laboratory of Testo Industrial Services has one of the best measurement uncertainties in Europe with an accuracy of 0.2 %rh in a measuring range of  2 to 98 %rh.

Calibrations are offered in various humidity generators such as the Huminator (two quantity generator), 2pressure/2temperature humidity generator as well as in the climatic chamber. With the addition of a new primary humidity generator, the thermodynamics laboratory of Testo Industrial Services is completed by a further measuring system. In addition to capacitive and resistive humidity measuring instruments/data loggers/transmitters, high precision reference standards such as dew point mirrors and dew point transmitters can also be calibrated.

Kalibrierung von Feuchtedatenlogger im Feuchtegenerator


In the field of humidity we are specialized in the following measuring instruments:

  • Dew point mirror
  • Electronic/mechanical hygrometers
  • Humidity data logger
  • Transmitter
  • Psychrometer
  • Pressure Dew Point Meter

Primary laboratory temperature

In the thermodynamic primary laboratory of Testo Industrial Services, we calibrate your high-quality reference standards at the highest metrological level. These include, for example, temperature fixed point cells, resistance thermometers (SPRT), precious metal thermocouples or dew point mirrors.

With the extension of a primary humidity generator, the thermodynamics laboratory of Testo Industrial Services is completed by a further measuring system. This allows us to offer highly accurate calibrations of moisture meters. The primary standard enables the fully automated presentation of stable and reproducible humidity values in a wide measuring range from 2 to 98 %rh (-32 to 95°C frost/dew point) with the smallest measurement uncertainties in Europe.

The metrological connection is realized via the standards of the PTB. The minimal measurement uncertainties are the result of many years of experience in temperature and humidity measurement technology and a unique interweaving of our accredited measurement variables pressure, temperature, humidity, flow and electrical.

Wassertriplepunktzelle im Primärlabor für thermodynamische Messgrößen


In our primary laboratory we are specialized in the following measuring instruments:

  • Fixed point cells
  • Resistance thermometer
  • Thermocouples
  • Dew point mirror / hygrometer
  • Humidity sensors

Light intensity

In the field of occupational safety, the measurement of luminous intensity plays a decisive role, because good working conditions are paramount. This also includes checking the lighting conditions at the workplace. Therefore, luminous intensity meters are used in almost all industries.

Testo Industrial Services has the competence to perform calibrations of luminous intensity meters in a measuring range from 0 to 10,000 Ix.

Messung von Lichtstärke


In the field of luminous intensity we are specialized in the following measuring instruments:

  • Lux probes

Success stories

We support you in your projects and are committed to your goals. Here you will find an excerpt from the references of our successful projects:



Calibration of glass thermometers in the thermodynamic laboratory


Our know-how summarized for you:
In our Knowledge-Centre you will find helpful know-how from our experts on thermodynamic calibration or dive into an interesting technical article on the subject of calibrating high-precision reference standards. 

Our scope of services for you

In addition to standard ISO calibrations, our scope of services also includes accredited DAkkS calibrations. Here you will find an excerpt of the services we offer in our laboratories and at your premises.

Measured variable Temperature: Temperature data loggers, glass thermometers, thermocouples, etc.Calibration DAkkS-accredited*On-site calibration
Air immersion sensors (e.g. PT100, NTC, thermocouples)
Glass thermometer
Temperature data logger, transmitter, transmitter
Monitoring systems
Block calibrators, circulators
Measured variable Surface temperature: Thermal imaging camera, infrared measuring device, etc.Calibration DAkkS-accredited*On-site calibration
Surface temperature sensor
Thermal imaging camera
Infrared measuring device, pyrometer
Measured variable Humidity: Dew point mirror, humidity data logger, psychrometer, etc.Calibration DAkkS-accredited*On-site calibration
Dew point mirrors
Humidity data loggers, transmitters, electronic hygrometers
mechanical hygrometers (thermohygrograph, drum recorder), psychrometers (only with electrical display)
Psychrometer (factory calibration)
Humidity generators
Pressure Dew Point Meter
saturated salt solution
Monitoring systems
Measured variable Primary temperature: Fixed point cells, IRTD probes, etc.Calibration DAkkS-accredited*On-site calibration
Fixed point cells
Resistance thermometer at fixed points incl. determination of coefficients/characteristics
Precious metal thermocouples type S, R or pure element TE Pt/Pd, Au/Pt at fixed points
IRTD probes
Measured variable Light intensityCalibration DAkkS-accredited*On-site calibration
Lux probes

*in the lab

To read

Take a look at our topic-specific brochures and find out more about calibrating your thermodynamic measuring devices.