Which way do the calipers go?

We may be overthinking the issue.
No biggie...I know a guy that LOVES to overthink stuff. One time ....
He told me that he sat one day pondering about his sprinklers....He wondered if a sprinkler with a finer mist has a greater risk of evaporation before making contact with the grass. This is not a joke, he actually thinks this way. I really like the guy though, he is a fun guy but thinks a LOT.