You don't really need a graduated cylinder, all you need is enough depth to let the hydrometer float at the ending gravity. Measure your hydrometer from the bottom (weighted end) to the 1.0 scale and get one at least that length. Diameter is up to you but the larger the diameter the more wort/beer you need to fill it.
Baseball is purer than life; it's symmetrical, fair, and dignified. There's no debating what happened: it happened.