Cannon-Fenske uncalibrated viscometer tube for use in obtaining kinematic viscosities of transparent liquids (ASTM Method of Test D445). Kimax® tube is designed from ASTM Specification D446 and is permanently marked with an individual serial number. Viscosity ranges shown below are for an efflux time greater than 200 seconds. Lines and legend are printed black. Manufactured from 33 expansion, low extractable borosilicate glass conforming to USP Type I and ASTM E438, Type I, Class A requirements. Calibration against a standard liquid of known viscosity or against a second viscometer with a known constant must be made before use.