My Raka hardener pump had a plastic stop on it that would put out half a squirt. I was into measuring real accurately using the side of the container, but then I noted that the plastic stop on the hardener pump was putting out just the right amount of hardener. From then on I would just do say 3 pumps of resin and 3 half-pumps of hardener. When I finished the resin & hardener containers they were empty at the same time.

My lesson is to verify how accurate the pumps are, and if they're close enough, then just start pumping and stop measuring. Don't lose count on how many you did though or you could be throwing a batch away.