TLG® cylinder with single metric scale. The "TD" (To Deliver) appears on each cylinder. Calibrated at 20°C, with flat hexagonal base for added stability made from Borosilicate 3.3 glass. They can be repeatedly used without drying. Bumpers are supplied with sizes 25 through 2000mL. Designed as per ASTM Specification E1272, Style 1, Class A requirements. Comes with Individual Calibration Certificate.