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 AS, DE-M marking, AR-Glas®. DIN EN ISO 835. Type 3 (zero point at the top), total delivery. Calibrated to deliver (TD, Ex). Waiting time 5 s. Marks and inscriptions in high contrast blue enamel.