I use a ball pipette for measuring Rodinal - it has a 10ml scale with 0,1ml incriments and is much better to use than a syringe.

More exact, I can put it deeper in the bottle and I can clean it MUCH better. And those things arent much more expensive than a single-use syringe.

For the rest - glas graduated cylinders, 10ml, 25ml, 100ml and a cup for the full liter.

I usually use either Rodinal (5-10ml) or A49 (50ml), but sometimes E6 is in the game, too... and for one-shot use I only need 150ml in the Jobo, which makes up for very small amounts of concentrates.