You may find yourself ordering some Paterson graduates. The 600ml [COLOR=#333333]borosilicate graduated beakers (I have some by Pyrex and another maker) are marked off in 50ml measures and stop at 500ml (the other graduates are similarly afflicted). Not terribly useful for measuring 600ml, unless you're willing to mark it with a Sharpie and keep renewing the mark periodically. They're great for having the chems ready to pour, but frankly I feel like I wasted my money.