深夜在线观看免费高清在线影院av,最近最新中文字幕MV免费版,91香蕉视频好色先生TV下载,国产一二中文字幕91影院日韩欧美

European reference materials  ERM  
歐洲標準局標準物質Institute of Reference Materials and Measurement  

Three major European reference materials producers have combined forces to produce a brand new standard in reference materials to ensure reliability and comparability of the results of chemical analysis.

European Reference Materials are certified materials, which undergo uncompromising peer evaluation and offer highest quality and reliability.

They are a major tool for improving the confidence in, and the mutual recognition of test results and certificates in a global market. CRMs comply with high metrological requirements, ensuring traceability of measurements results, and are the end-point of the traceability chain, thus being primary standards in chemistry.