Amber-colored borosilicate glass volumetric flasks are manufactured as per ASTM E288 Class A serialized glassware specifications. Calibrated to contain (TC), these flasks feature white enamel printing and diamond etched graduation line. Our flasks feature heavy duty and uniform wall thickness, and a wide mouth design for easy pipette access. Amber color protects light sensitive materials. Each unit comes with a printed calibration certificate, as well as with a printed QR code for easy access to the calibration certificate any time / anywhere, using your mobile device or computer. Additional Info: Volumetric Flasks, Class A, Individually Certified, Wide Mouth, Amber Glass, Qr, 20ml Package Size(L x W x H): 5.5 X 2 X 2 (IN) Categories: Flasks, Glass HTS Code: 7017.90.5000 UNSPSC: 4.11218e+007 Country Of Origin: INDIA