The Alvin Architects Pocket Tape Rule, or Estimator's 5' tape, is a great tool for the architect on the go. It has a compact size of about 2 inches square, so it fits nicely in a pocket or tool pouch. The yellow steel tape has a slide button that will lock it in place while measuring. With a simple push of the button, the tape will retract into the casing.
Each side of the Architects Pocket Tape Rule has two scales, one on each side of the ¼ inch wide tape, with the numbers printed in black The front side of the tape has a ¼ inch to a foot scale, while the back side of the tape is a 1/8 inch to a foot scale. This is a great way to be able to check a blue print against the full sized structure or area.
One feature is a keyring, so it can keep work related keys handy. Another nice feature is a hanging cord, so it can be hung on a hook near a drafting table or other work area.