Manufactured from pre-vacuum calibrated borosilicate 3.3 tubing according to DIN/ISO Class – AS standards. Featured with an intermediate PTFE stopcock for fast and accurate measurement. Clear automatic burettes are featured with a schellbach stripe for easier and accurate observation of the meniscus line. Inscriptions and nominal values on clear burettes are printed with blue enamel. Automatic burettes are supplied without bottles and bellow. Bottles and bellows should be ordered separately.