This is so simple I can’t believe how long it took me to think of it. I only need a tiny, itty-bitty amount of pH down at a time, and I wanted a way to dose it consistently. I take a small, measured amount of pH down and add it to an empty tincture bottle and fill up with water. I add the water to make the solution weaker, so I need more drops, so that the variance in drop size doesn’t matter much.
I use the tincture bottle dropper and can count drops until the pH is right. Make a note of the drop number and I won’t have to check pH every time I mix up a new batch of nutes.