DEY KAY SCIENTIFIC brand pipettes are manufactured from specially selected machine-drawn borosilicate accurate bore glass tubing. They have precision formed jets, bevel ground ends to resist chipping. The graduation marks are in durable white enamel or amber stain, resistant to normal laboratory reagents and repeated washing. All the pipettes are individually measured and then marked. Due to uniformity of bore, accuracy is ensured between any two readings. The pipettes can be autoclaved and, if necessary, can be flamed for sterilisation. Cat no. 7059, 7060, 7079 and 7080 are colour coded on top according to I.S.O. Standards to facilitate easy identification. The Graduation marks are screen printed. The OD of pipettes size 5 ml and above are tooled with uniform OD and ID for easy sucking and cotton plugging. This tooling also gives added strength.