These class A glass volumetric pipettes for a variety of general laboratory uses. These pipettes are calibrate to deliver. This means they are designed to deliver the amount of fluid shown within +/- 0.01 ml. Each size is labeled with a marking on the bulb, and color coded (ASTM E1273) for easy identification. Pipette, volumetric, blue scale, batch certified, class AS. Graduated and volumetric pipettes meet the highest quality standards according to DIN EN ISO 835 – 648, DIN 12697 and BS 700 – 1583. Calibrated “to deliver” (TD) at 20°C, these borosilicate glass, color coded pipettes are fabricated to meet the requirements for accuracy, appearance, glass quality and calibration line accuracy.