Forget the saying and measure once and get it right with the Rule/One Pen Ruler by HMM. In addition to giving you accurate lengths and widths, this handy utensil has a built-in pen. With this, you can instantly and accurately mark your intended spot with impeccable precision. You never have to worry about carrying a writing utensil again. As an honourable mention recipient of the reddot award in 2015, the Rule/One is as efficient as it is practical. However, it’s not just compatible with surfaces for ink. In addition, the Rule/One also functions seamlessly with your tablet or touchscreen. The interchangeable tips are a cinch to swap out so your workflow is always smooth. Finally, you have your choice between black, silver, and orange for your pen color.