If you use a clipboard on the job, you know how difficult it is to find a place to put it down while you handle the tape measure or tools you’re using. There’s never a good place to put it except to tuck it under your arm where it often gets dropped. Solve that problem by building a clipboard with a spring clamp on the back and you’ll never look for a spot to put it down again. Here's a YouTube video which shows more details.
-- Matt CueBall Rosendaul. I don't think I've ever had a cup of coffee that didn't have cat hair or sawdust in it.