... are sterile and non-pyrogenic. 1. Clear and bidirectional graduations on the pipettes, negative graduation allows additional working volume,2. Color ... 1, 2, 5, 10, 25 and 50mL,6. Dark numeric marks on the serological pipettes are easy to read and identify,7 ... . WHB disposable plastic labware Provides Free Sample,8. OEM service on WHB disposable serological pipette offered,9. 300 pcs/ bag, 1800 ...