Manufactured from 3.3 Low Expansion Borosilicate precision bore tubing. Individually calibrated on automatic calibration machine for precision and high accuracy. Graduation and inscriptions are printed with white enamel for increased visibility with dark solutions. Choice of PTFE stopcock, Boroflo stopcock and Straight Bore Glass Stopcock. Calibrated at 20°C. Capacity available 10/25/50/100ml.