A national comparison of dc resistance at 10 MΩ and 1GΩ level was organized by the Electromagnetic Division of National Institute of Metrological Research (INRIM, Italy) and piloted by the same Division. This comparison took place between January and April of 2008 with the participation of 8 secondary Laboratories accredited by the Italian Accreditation of Calibration Laboratories Service (SIT). The travelling package included a wire-wound 10 MΩ standard and a thick film-type 1 GΩ standard in a wooden anti-shock container designed by INRIM. The obtained results indicate that the differences at 10 MΩ and 1 GΩ between each laboratory's value and its reference value are all within the expanded relative uncertainties of these differences.
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