What is this?

[Dave Lehnert]

Universal Tool Company. Cincinnati, Ohio

What is it? Rafter Sq.

[John Schreiber]

Rafter square was my first guess, but I can't figure out anything it does beyond what a regular carpenter's square already does. Maybe if it had a built in level?

[Tom McMahon]

Possibly for laying out stair stringers.

[Rick Rutten]

I think you could almost call it a multi-square. Are there index marks on the adjustable portion?

[Steve Thomas]

an inclineometer

roofing pitch?

maybe

[Dave Lehnert]

I think you could almost call it a multi-square. Are there index marks on the adjustable portion?

Not sure about the index marks. This item comes up on Craig's List about once a week.