DRRR (Deutsches Referenzbüro für Ringversuche und Referenzmaterialien GmbH) provides external quality assurance services for industrial, public, and private laboratories. An internationally active provider accredited to ISO/IEC 17043, the company has more than 15 years of experience and conducts over 1,100 proficiency tests each year. Its services combine statistical expertise with technical knowledge, and digital processes support activities from registration through results reporting.

DRRR offers proficiency tests, also known as interlaboratory comparisons, and certified reference materials characterized through these tests. Its programs cover food and animal feed, materials and product testing, consumer goods and packaging, medical devices, and environmental analysis. Relevant samples include foods, plastics, metals, textiles, building materials, water, soil, and medical products. The company also provides customized monitoring programs, quality management consulting, audits, assessments, seminars, and training. DRRR supports laboratories with analytical and testing questions, including chemical, microbiological, molecular, immunological, sensory, and physical-mechanical methods, as well as measurement uncertainty and statistical calculations. Its ODIN online system helps customers find, book, manage, and report results for proficiency tests.