A European ultralow temperature scale

Abstract A collaborative research project, supported by the Standards, Measurement and Testing programme of the European Union, has been undertaken to standardise sub-kelvin temperature measurements across European national measurement institutes. Traceability to the resulting European ULT scale has been enhanced by the development of a new prototype superconducting reference device. New glass capacitance thermometers for measurements in high magnetic fields have also been characterised. The main results of the project are presented.