CELLTREAT Scientific Products 50mL Serological Pipets are manufactured to the ASTM Standard Specification for Serological Pipets E-934. Bi-directional (positive and negative) graduations are printed in bold easy-to-read ink. Premium material barrier plug. Color coded stripes and packaging enable quick volume identification. Printed indicator arrow for quickly locating negative graduations when using a pipet controller. Now available in double case quantities. Double case serological pipets offer a price savings. Save up to 65% on shipping costs. Reduce your order frequency and cardboard waste.