A few months ago I bought some Bomax beakers from Photographer's Formulary and, believe it or not, I'm not sure I'm using them right (!). The problem is that the last measuring mark on each beaker is one level shy of its rated capacity: the 1000 ml is only marked to 900ml, the 50ml is only marked to 40ml, etc... There's plenty of extra glass (capacity) available for that last critical mark, but the damned things just aren't there. Obviously, it's not difficult to guess where they would be, but I'm wondering whether the design assumes some procedure used by chemistry-literate people that automatically results in the proper measurement. Stupid as I am, I just can't figure out what that would be.