VSL is the Dutch National Metrology Institute and is an internationally authoritative knowledge institute in the field of metrology. As well as the management and development of the national primary measurement standards. The National Physical Laboratory (NPL) is the UK’s National Measurement Institute, and is a world-leading centre of excellence in developing and applying the most accurate measurement standards, science and technology available. The Paul Scherrer Institute, PSI, is the largest research institute for natural and engineering sciences within Switzerland. PSI performs world-class research in three main subject areas: Matter and Material; Energy and the Environment; and Human Health. By conducting fundamental and applied research, PSI works on long-term solutions for major challenges facing society, industry and science.