Our Certified Reference Material - CRM of Conductivity are kept on test during three months. Period necessary to prove its Stability, homogeneity and uncertainty. Constituted by a flask with 250 ml accredited by Cgcre. The certified Reference Material meets ABNT ISO Guia 34 and ABNT NBR ISO/IEC 17025 Standard. Look the models on the table below and click to check the characteristics of the materials.