DURAN® Mixing cylinders are for diluting solutions and mixing several components in a given quantity ratio. Available in two different accuracy Classes – Class A with main ring points graduation and Class B with line graduation. For additional differentiation have the mixing cylinders with accuracy Class A a blue graduation and the B Class mixing cylinders a white graduation. Volume content tolerances for measuring and mixing cylinders conform to DIN and ISO accuracy limits. Thus the desired concentration can be precisely set. Mixing cylinders with a batch number and accuracy Class A are supplied with a batch certificate. This certificate documents the mean value obtained from measuring the batch in question, the standard deviation and the day of issue. The batch certificates can also be retrieved online. The batch number consists of four digits. The first two numbers specify the production year, and the following two numbers specify the batch, e.g.: 18.01.