We are your provider for proficiency testing and reference material

The "Deutsches Referenzbüro für Ringversuche und Referenzmaterialien" (DRRR GmbH) is an ISO/IEC 17043 accredited proficiency testing provider and provider of certified reference material. As a leading service company for external quality assurance, we are internationally operating and offer all aspects of quality assurance from one single source.

For more than 15 years, the DRRR has been offering services in the field of quality assurance. With more than 500 proficiency tests performed per year, the DRRR is one of the largest providers worldwide. In addition to these many years of experience, you also benefit from our high level of competence in the field of statistics combined with technical expertise.

Our proficiency tests are characterized by the following features:

We offer you numerous certified reference materials, adapted to our proficiency testing programs. In addition, we offer quality consulting as well as trainings for quality assurance in laboratory and production. We also support our customers in questions of analysis (chemical-physical, immunologic, molecular biologic and microbiologic, organoleptic) and testing (physical-mechanical), as well as concerning statistical issues. Particularly in the calculation of the measurement uncertainty we can support our customers with many practical examples, e.g. based on testing of reference materials or by participation in proficiency testing rounds.