All BLAUBRAND® burettes, automatic burettes and bulb pipettes 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, USP individual certificate or DAkkS calibration certificate.BLAUBRAND®, class A, DE-M marking. AR-GLAS®. Error limits and subdivisions acc. to DIN 12689, length 360 mm. Calibrated to contain (TC, »In«). Ring marks at major graduation marks. Marks and inscriptions in high contrast blue enamel.