We manufacture Certified Reference Material - CRM pH to 25°C, with flasks of 250 mL accredited by Cgcre according the ABNT ISO GUIA 34:2004 Standard. The attributions of the certified values produced meet the requirements of the ABNT ISO GUIA 31 standards regarding the contents of the certificates and the ISO GUIDE 35 regarding the characterization and traceability of the declared property values. Look the models on the schedule below and click to visualize the characteristics of the materials: