<P> A graduated cylinder, measuring cylinder or mixing cylinder is a common piece of laboratory equipment used to measure the volume of a liquid . It has a narrow cylindrical shape . Each marked line on the graduated cylinder represents the amount of liquid that has been measured . </P> <P> Large graduated cylinders are usually made up of polypropylene for its excellent chemical resistance or polymethylpentene for its transparency, making them lighter and less fragile than glass . Polypropylene (PP) is easy to repeatedly autoclave; however, autoclaving in excess of about 121 ° C (250 ° F) (depending on the chemical formulation: typical commercial grade polypropylene melts in excess of 177 ° C (351 ° F)), can warp or damage polypropylene graduated cylinders, affecting accuracy . </P> <P> IHN traditional graduated cylinder (A in the image) is usually narrow and tall so as to increase the accuracy and precision of volume measurement; it has a plastic or glass bottom and a "spout" for easy pouring of the measured liquid . An additional version is wide and low . </P>

What is a graduated cylinder made out of