BLAUBRAND ® , Boro 3.3. DIN EN ISO 1042, DE-M marking. With PP / PE stopper. Calibrated to contain (TC, In). Marks and inscriptions in high contrast blue enamel. All BLAUBRAND ® volumetric flasks are supplied with a batch number and an accompanying batch certificate in the original packaging. On request, they are also available with an individual certificate or DAkkS calibration certificate. BLAUBRAND ® , Boro 3.3. DIN EN ISO 1042, DE-M marking. With PP / PE stopper. Calibrated to contain (TC, In). Marks and inscriptions in high contrast blue enamel. All BLAUBRAND ® volumetric flasks are supplied with a batch number and an accompanying batch certificate in the original packaging. On request, they are also available with an individual certificate or DAkkS calibration certificate.