I bought a $9.99 watch from CVS. Ya know, a little painter's or masking tape placed just-so can transform a $9.99 watch into a 35 minute-ish or 180-ish watch.
I do 99% of RC with the highlighter, but just for extra assurance that I don't skim over it I'll quickly note "M.P." in pencil when, and only when, I've decided that I've found the main point. Otherwise, strictly highlighter.