Lawyers. . . .Philbert, this warning seems rather ridiculous: . . .
That's up to the user. It does not prevent anyone from cutting with a buddy. Even when I have cut with dozens of people around (e.g. GTGs or charity firewood cutting events), we each marked our own cuts. Sometimes I have worked with a buddy to pick up the wood that the other person cuts, or to stage logs onto a saw buck to keep the actual cutting time 'up'.Very good review and pics, Philbert. Looks like an interesting idea. But I think this "stick" might encourage someone to cut wood without a helper to pre-mark the cuts.
What I like about this measuring tool is that I don't have to use a lumber crayon (or spray paint), a separate measuring stick to put down (and misplace), repetitively turn the saw sideways to measure with the bar, etc., along with the convenience factors noted. If you prefer to measure and mark first, the videos attached to the manufacturers' websites show how to mark using saw kerfs, before returning to cut all the way through.
Philbert