INTERLABORATORY COMPARISONS – Proficiency Testing Provider

SA Quality for Metrology is an accredited Proficiency Testing Provider in the field of calibration.

In accordance with  ISO/IEC 17043:2010 standards, we are accredited by the Italian body Accredia with PTP Accreditation Certificate PTP No. 0024P.

According to EA, IAF and ILAC Mutual Recognition Agreements we are authorized to operate at an international level.


Organization of Interlaboratory Comparisons

In order to consistently confirm their performance over time, any testing / calibration laboratory needs to participate periodically in Interlaboratory Comparisons (ILC) – also called Proficiency Testing (PT) – as required by ISO/IEC 17025 standards.

ILCs are effective tools used to assess the performance of specific tests or measurements, and allow for accurate and continuous monitoring. This enables the laboratory to validate its uncertainty statements and ensure the metrological traceability.

Furthermore, according to ISO/IEC 17025 standards, participation in ILCs is a mandatory requirement for obtaining and maintaining specific accreditations for testing or calibration procedures, and may also be requested by partners or customers / clients.

Regardless of the results, participating in ILCs is always advantageous. Positive results provide a guarantee of quality and reliability, instilling confidence in customers / clients. Unsatisfactory results prompt laboratories to improve their procedures and service efficiency.

Our key points of excellence

  • Registration for Proficiency Testing is done through our Proficiency Testing Web Portal (PT Portal). Information and documents are uploaded directly to the PT Portal, eliminating the need for numerous email exchanges with your provider.
  • You will always have direct contact with the cycle coordinator.
  • All cycle-related information is managed directly on the PT Portal, ensuring maximum transparency.
  • We issue a report for each individual participating laboratory, allowing you to access simplified reports specific to your activities.
  • At the end of the cycle you will have the samples available free of charge for one week to carry out your internal tests with the reference value.

Organization of Bilateral Interlaboratory Comparisons

In addition to circuit-based tests, we also organize Bilateral Proficiency Testing. In this type of testing, a single participating laboratory is compared to a reference laboratory.

We organize Bilateral Comparisons upon request, when the requesting laboratory needs to obtain a specific accreditation or when there are no other laboratories performing the same type of calibration.

If you wish to request a Bilateral Comparison, please send us an email specifying:

  • Type of instrument.
  • Calibration methodology.

We will provide you with a quotation and information regarding participation methods.

Interlaboratory Comparisons program and registration

Below we present the updated ILCs calendar in which you can participate. By clicking on SHOW you can access the description card for the respective comparison, which includes technical information and participation methods. From each card you can also download the participation form, which shall be completed and uploaded to the PT Portal upon registration.

To register for an ILC, you will need to create an account that will grant you access to the reserved area of our website and the PT Portal. On the portal you can autonomously register for comparisons, with no need to send us requests or attached documents by email.

If you want to participate in a Bilateral Interlaboratory Comparison, please send us a request by email, specifying the type of instrument and calibration methodology involved in the comparison. We will provide you with a quotation and information regarding participation methods.

Year: 2024
Updated to: May 24
PT codeDescriptionRegistration untilExpected conclusionState*Details
ILC001-2024Gauge blocks up to 1000 mmFebruary 2024December 2024AccreditedShow
ILC003-2024Thread plug gaugeSeptember 2024January 2025AccreditedShow
ILC006-2024Gauge blocks up to 100 mmFebruary 2024December 2024AccreditedShow
ILC015-2024Roughness sample Rev02August 2024May 2025AccreditedShow
ILC005-2024Cylindrical Plain Plug up to 100 mmJune 2024February 2025AccreditedShow
ILC011/A-2024Torque wrenches up to 250 NmFebruary 2024December 2024AccreditedShow
ILC011/B-2024Torque wrench 65 - 650 NmFebruary 2024December 2024AccreditedShow
ILC021-2024Reference WeightsMarch 2024December 2024Not AccreditedShow
ILC022-2024Vickers Hardness TesterClosedJune 2024Not AccreditedShow
ILC002-2024Cylindrical ring gauges up to 100 mm Rev00August 2024April 2025AccreditedShow
ILC004-2024Dial GaugeFebruary 2024October 2024AccreditedShow
ILC009-2024Digital micrometer 0-25 mmMarch 2024November 2024AccreditedShow
ILC008-2024Caliper 0 - 150 mmMarch 2024Novembre 2024AccreditedShow
ILC023-2024Digital protractor Rev00December 2024September 2025AccreditedShow
ILC024-2024Uniaxial testing machineSeptember 2024December 2024Not AccreditedShow
ILC025-2024Charpy impact pendulum Rev00September 2024December 2024Not AccreditedShow
Year: 2025
Updated to: May 24
PT codeDescriptionRegistration untilExpected conclusionState*Details
ILC006-2025Gauge blocks up to 100 mm Rev00February 2025December 2025AccreditedShow
ILC016-2025Cylindrical plain plug gauge up to 200 mm Rev00June 2025February 2026AccreditedShow
ILC002-2025Cylindrical ring gauges up to 100 mm Rev00February 2025December 2024AccreditedShow
ILC008-2025Digital calliper (0 - 300) mm Rev00March 2025November 2025AccreditedShow
ILC009-2025Digital micrometer (75 - 100) mm Rev00March 2025November 2025AccreditedShow
ILC004-2025Analog dial gauge Rev00February 2025October 2025AccreditedShow
ILC001-2025Gauge blocks up to 500 mm Rev00February 2025December 2025AccreditedShow
ILC026-2025Temperature calibrator (measurement and simulation) for thermocouple Rev00April 2025December 2025Not AccreditedShow
ILC011/D-2025Torque wrench (20 - 200) N·m Rev00February 2025December 2025AccreditedShow
ILC011/C-2025Torque wrench (100 - 1000) N·m Rev00February 2025December 2025AccreditedShow
ILC011/A-2025Torque wrenches up to 250 N·m (ISO 6789-2 and DKD-R 3-7) Rev00February 2025December 2025AccreditedShow
Year: 2026
Updated to: May 24
PT codeDescriptionRegistration untilExpected conclusionState*Details
ILC005-2026Cylindrical plain plug up to 100 mm Rev00June 2026February 2027AccreditedShow
ILC008-2026Digital calliper (0 - 150) mm Rev00March 2026November 2026AccreditedShow
ILC014-2026Roundness sample Rev00May 2026December 2026AccreditedShow
ILC009-2026Digital micrometer (0 - 25) mm Rev00March 2026Novembre 2026AccreditedShow
ILC004-2026Digital dial gauge (0 - 12,5) mm Rev00February 2026October 2026AccreditedShow
ILC012-2026Shore A Hardness Tester Rev00March 2026June 2026Not AccreditedShow
ILC011/B-2026Torque wrench (65 - 650) N·mFebruary 2026December 2026AccreditedShow
This schedule is updated quarterly.
Each comparison will be activated with the participation of at least 5 laboratories.
*Accreditation is the certification by a third party (ACCREDIA) that the p.t.p. complies with the requirements of the international reference standard UNI CEI EN ISO / IEC 17043 and other ACCREDIA prescriptive documents in the organization of interlaboratory comparisons, ensuring their technical and organizational competence.
The list of accredited schemes is shown in the attachment to the accreditation certificate no. 0024P.


For inquiries, quotes or customized service requests, please use this contact form.

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