Acme Scale Pen

Designed by Japanese architect Shigeru Ban, the Acme Scale Pen is, of course, a writing implement, but also functions as a full-featured architect’s scale thanks to precise etchings all along its aluminum body. Uniquely, the latter is triangular to facilitate its functioning as a scale, though it also provides a comfortable hold in hand and twists at its center to reveal the ink cartridge tip. It’s otherwise compatible with two of Acme’s ballpoint ink refills, the Easy Flow P9000 and the P900 M.

Pick one up at Amazon or Acme Studio – $90