These Nessler tubes are ideal for color comparison.
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
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