Shadowless bottom transmits undistorted light. There are no dark spots when the tube is filled with liquid and viewed from the top using a light source beneath the tube. Narrower and taller with a much longer scale length than C5414. The 50mL size is specifically mentioned by the American Public Health Association in Standard Methods for the Examination of Water and Waste Water. Rings and legend are durable white ceramic enamel. Rings coincide with specific volumes of liquid. Designed from Federal Specification NNN-T-175, Type 1, Class 2 requirements. Graduations: at 50mL. Dimensions (O.D. x L): 20mm x 300mm. Scale Length: 200mm-220mm. 6/Case. Kimble® #: 45315-50.