Translucent flask is supplied with tapered polypropylene stopper with an individually calibrated ­graduation line. The product is manufactured to Class B tolerances as defined by ISO 1042. Exposure to temperatures above 60°C may affect accuracy. Recommended routine cleaning up to 60°C will ­preserve graduations. Height dimension is for flask only, without stopper. Translucent flask is supplied with tapered polypropylene stopper with an individually calibrated ­graduation line. The product is manufactured to Class B tolerances as defined by ISO 1042. Exposure to temperatures above 60°C may affect accuracy. Recommended routine cleaning up to 60°C will ­preserve graduations. Height dimension is for flask only, without stopper.