Shadowless bottom of each tube transmits undistorted light
· Rings and legend are durable white ceramic enamel which correspond with specific volumes of liquid
· 45315 series is unmatched
· 45315A series is supplied in a matched set of 6
· 45315B series is supplied in a matched set of 12
· Graduated ring scale of any of the tubes within a set will not vary from that of any other tube within the set by more than 1.5 mm for the 50 mL and 2.0 mm for the 100 mL sizes
· The 50 mL size is specifically mentioned by the American Public Health Association in Standard Methods for the Examination of Water and Waste Water
· Manufactured from 33 expansion, low extractable borosilicate glass conforming to USP Type I and ASTM E438, Type I Class A requirements