would be great if someone made a 'layout tape'... the hook would be 6" or so from the start of the markings, @ 0. And the hook would only really be there so you could hook it, walk down a wall or timber, and then position the tape.
or maybe a 2 sided tape, in a round case. 1 side with 0 starting at the hook. the other for layout.
kickstarter anyone?
