DIN EN ISO 21968:2020-02 金屬和非金屬基材上的非磁性金屬涂層 涂層厚度的測量 相敏渦流法
Non-magnetic metallic coatings on metallic and non-metallic basis materials - Measurement of coating thickness - Phase-sensitive eddy-current method (ISO 21968:2019); German version EN ISO 21968:2019