Welcome to the DRRR

The German reference office for
proficiency testing and reference materials


…with more than 500 accredited proficiency testing schemes…

NEW 1 In the interest of improved clarity and better orientation in all test matrices the catalogues have a new structure. There are 4 catalogues available:

– food and feed

– microbiology

– consumer goods / packaging

– material testing

NEW 2 We extended our scope of accreditation acc. to ISO 17043 significantly. In the field of the plastic and textiles more than 70 new test methods are accredited, overall you can find more than 180 accredited proficiency testing schemes in the field of material testing.

NEW 3 More than 40 new proficiency testing schemes in the field of microbiology (e.g. medical devices, indoor air and food) and material testing (e.g. plastics and textiles). We are also planning further developments in the field of food and feed, we will keep you up-to-date with our newsletters.

The German reference office for proficiency testing and reference materials (DRRR) is a service company for external quality assurance of laboratories of the food industry, the packaging / consumer goods /plastic industry and building industry.

We are an inspection body, reference material producer and proficiency testing (PT) provider. For a wide selection of proficiency testing schemes the DRRR is accredited acc. DIN EN ISO/IEC 17043 (please look into the appendix of our scope of accreditation). We offer many certified reference materials as well as advise on quality matters and quality assurance training in the laboratory and the production.
Additionally we provide advice to our customers in all question of validation of chemical-physical, microbiological, organoleptic and physical-mechanical analysis or statistical questions.

Our clients and what we do for them

Our German and international costumers are companies of the food and dairy economy and state laboratories as well as food and veterinary inspection services.


DRRR quality assurance program plastics and textiles


new product catalogue for the year 2018 / 2019


Proficiency testing projects: Testing and profiling of mineral oil hydrocarbons (MOH) in cacao products


DRRR quality assurance program microbiology