All 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. 10mL Wide Tip Serological Pipet for viscous solutions – Wide Tip opening is 4x larger than standard 10mL pipet. Available individually wrapped in bag or convenient shelf carton and bulk packed in bags. Reduce your order frequency and cardboard waste.