Testo Industrial Services is accredited in accordance with DIN EN ISO/IEC 17025:2018 as a calibration laboratory
and is accredited for over 300 calibration procedures. Our aim is to provide you with the best possible service so that your processes and procedures meet the required standards
. Our innovative spirit and the increasing demands of the market mean that we are constantly evolving. Our technicians and engineers are experts in their fields and are happy to pass on their knowledge to our customers.

What is the difference between an ISO/factory calibration and a
accredited calibration (DAkkS)?
An ISOcalibration is always subject to the self-commitment of the laboratory, whereas DAkkS calibrations are regularly checked and monitored by the German accreditation body (DAkkS) in terms of form, structure and content. This ensures that accredited calibration laboratories have both the technical competence and equipment as well as a suitable management system. Calibrations that are not subject to
an accreditation (ISO/factory calibrations) are not subject to these controls - in this case, the customer must monitor the quality of the calibration laboratory himself by means of appropriate audits.

When is a DAkkS calibration necessary?When do I need ISO?
DAkkS calibration certificates are suitable for all users of measuring devices who require a particularly high level of safety. In addition, some industries require accredited calibrations to be carried out. For example, factory standards, i.e. measuring instruments that are used to calibrate other test equipment, are often "secured" with a DAkkS calibration certificate. DAkkS calibration certificates are also often required for measuring instruments in the automotive or pharmaceutical industries.ISO calibrations are suitable for users who are certified according to DIN ISO 9000ff and follow other industry-specific quality guidelines. The introduction and maintenance of test equipment calibration and
monitoring is required for all directives and standards and must meet the requirements of the various standards and be traceable to national standards.

What is the significance of the conformity assessment?
If the client wants a statement on the suitability of his measuring device, then an objective
pass/fail assessment of the metrologically determined characteristics of the calibration item is necessary. Such an assessment is referred to as a conformity assessment.

What is a decision rule?
Decision rules define the criteria for how measurement uncertainty is to be taken into account in conformity assessment. Quantitative control limits in the form of guard bands are introduced, which can reduce the acceptance range compared to the permissible deviation. In the conformity assessment, the measurement uncertainty is added to the measured deviation and a fictitious maximum deviation is generated. This must be within the tolerance so that the device can be assessed as being within it.