Feature●This is the most widely used volumetric pipet in general laboratory work●Designed from ASTM Specification E969, Class B requirements●Calibrated to deliver and feature a legend of permanent brown stain●Large numerals on the bulb indicate capacity●Color-coding (ASTM E1273) facilitates sorting and selection; band color blueDescription These 90mm U.S.P. Capillary Melting Point Tubes are made of Kimax-51 glass, have one open end and are designed from requirements contained in United States Pharmacopeia (USP). Length: 90mm. I.D.: 0.8-1.1mm. Wall Thickness: 0.25mm. Kimble #: 34507-99.