GTM GmbH - Calibration by GTM: precision measurement every time

Calibration by GTM: precision measurement every time

Calibrating your force transducers is a major contribution to quality assurance

Measuring units in industrial applications and laboratories require regular inspection if they are to produce precise results. This is what we at GTM specialise in. Our calibration lab has DAkkS accreditation (German national accreditation body). We also operate the world’s largest private-sector tensile/compressive-force measuring unit.

Measuring technology is unthinkable without reliable precision. Even the most minor imprecision can heavily impair a product’s or process’s quality. Quality impairment often leads to scrap, rework, damage claims and unnecessary costs. We can help you avoid all this by calibrating your force transducers.

“The unique measuring range, together with decades of experience in developing force measuring units, means our customers can rely on us. It also means that calibration orders are a lot easier to handle,” says Jan Molter, GTM’s commercial director.

Assuring quality

It has always been one of our primary goals to design measuring units with the least-possible measurement inaccuracy. All the measuring units in the GTM calibration lab are in-house designs. They meet the same standards as the systems for force and torque measurement GTM supplies to national institutes, calibration laboratories and sensor manufacturers worldwide. Our units often provide the national standards for the respective country, for example in Germany, Switzerland or Brazil.

GTM officially supplies Germany’s national metrology institute, the Physikalisch-Technische Bundesanstalt (PTB) in Braunschweig, who is appointed by Germany’s law on units of measurement and time to hold authority over the national standards. Our lab also has accreditation in accordance with DIN EN ISO/IEC 17025 by the Deutsche Akkreditierungsstelle (DAkkS). As a calibration service, we stand for traceable, precise measuring results.

Our outstanding work has earnt us a position among Europe’s leading suppliers of calibration for force, torque and multicomponent force transducers.

Superlative calibration lab

Side-by-side in our GTM calibration lab, you’ll find Germany’s smallest force measuring unit and the biggest private-sector measuring unit for tensile and compressive forces in the world. This dynamic duo provides a range of unparalleled breadth: we calibrate forces between 0.0005 and 10,000 kN.

At the top end of the force range, we find applications such as measuring forces in concrete testing machines, cable and chain testing for ship and bridge construction or testing of rocket propulsion stages and aeroplane chassis.

Turning our attention to the minutest forces, examples include calibrating sensors for verifying testing units for medical engineering or materials research.

To keep costs in check when calibrating major nominal loads – especially when it comes to tensile testing – our lab maintains a supply of standardised adapters.

Your application is too specific? Our experts can offer advice and tailor a perfect solution for your needs.

We are also accredited to perform on-site calibration of force measuring units with reference force transducers.

Top precision und reliability: calibrating forces and torques

Our calibrations, with lowest-possible measurement uncertainty, ensure that you can rely on the results of your measuring units at any time.

Our range for calibration of tensile and compressive forces in the private sector is unmatched – worldwide.

We calibrate torques in the range from 5 to 5,000 Nm at our own calibration lab. Besides torque transducers and torque measurement shafts, we can also calibrate torque wrenches with lever arms and transverse force application.

The master class: multicomponent calibration

Calibrating multicomponent transducers always requires a close and intense exchange with the customer and their specific application. In this discipline, we’re pioneers and guides: we have been accredited to perform multicomponent calibration since 2005 – and were the first calibration laboratory to be so anywhere in the world.

Our MKA specialist Helmut Raabe says: “Before multi-component technology came around, we were only using one of six eyes. Now we can finally see clearly in terms of forces and torques!”

Developing multicomponent calibration methods compliant with a variety of requirements from actual applications has allowed GTM to become the only laboratory that can validate multicomponent measuring equipment.

Besides being able to produce special adapters, we today also maintain a supply of more than fifty adapters in our GTM lab.

  Innovation: designing tomorrow’s calibration technology

Innovation has always been part of who we are. Today, we’re the number-one contact for forces and torques and consider ourselves obligated more than ever to engage in designing tomorrow’s calibration technology. Our engineers are constantly improving and modernising our calibration lab and developing new calibration methods.

One of these is our own method for calibrating reference force transducers used in force measuring units.

Our jockey-weight 25-kN force measuring unit is the first ever to allow calibrations in tensile and in compressive force direction by means of dynamic loading of a clamped test object – eliminating the need to reconfigure force application. This adds extra information gain: force transducer behaviour at zero force can only be assessed without reconfiguration.


As one of only a few calibration services in Germany, we also offer calibration of voltage ratios in addition to mechanical quantities. Voltage ratios need to be calibrated wherever DMS-based force and torque transducers are used.

Engineers from the GTM calibration lab share their expertise in committees set up by the DAkkS and the German calibration service DKD. Together with other experts, they discuss current issues such as calibration standards or draft calibration directives, thus engaging in shaping the industry’s future.

A wide field: industries and applications

A diverse range of industries and applications benefit from our capacities as a calibration service. These include:

  • Transfer force and torque transducers for calibrating testing machines (e.g. according to ISO 7500)
  • Force and torque transducers:
    • in component testing
    • in production monitoring equipment
    • in tyre testing
    • in aerospace engineering
    • in the automotive industry (e.g. in vehicle test rigs)
    • in materials analysis


The benefits of employing GTM’s calibration services at a glance:

  • Europe’s leading supplier of calibration services for force, torque and multicomponent transducers
  • Pioneer and innovator in multicomponent calibration
  • Unique breadth of services: We calibrate forces between 0.0005 and 10,000 kN
  • Reliable results thanks to direct tracing back to national metrology institute (PTB) and verified competence thanks to DAkkS accreditation
  • Industry pioneer: GTM drives calibration technology progress through membership in DKD and DAkkS committees


Oure calibration services

Adapter for lage forces

Constructing the 10-MN calibrating machine

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Our calibration certificates are created in German/English version. The certificates will be recognized in all countries which signed the multilateral agreements of the European co-operation for Accreditation (EA) and of the International Laboratory Accreditation Cooperation (ILAC)

Information and advice:
Phone: +49 6257 97 20-0
Contact person

Informative documents:
Certificate of Accreditation
Calibration- and delivery conditions



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