I think I have found an easier way to measure the stuff. I saved an empty dish-wash soap bottle, thoroughly rinsed it, and filled it with HC-110. I have a little graduate that goes to 100, and I fill it with water to 88. (I even put a little mark on it at 88). I then hold the squeeze bottle upside down and slowly squirt in the developer until the level is at 100. I need 600 mls, so it's 12+588. As soon as you stop squeezing the bottle, the flow stops, no mess. The little graduate is dumped into the big one, rinsed out a few times with water, which is added to the big one, and then it's filled to 600 mls. The little thing on the cap of the bottle even snaps shut.
Best of all, it was free.