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The Re-ruler is constructed from aerospace grade aluminum and offers both inches and mm together with a handy angle guide, compass, removable level and embedded magnets for easy storage.

Ruler by Xalpha Lab is a great example of a good ruler app. The app is entirely free with no ads or in-app purchases. It also comes with both imperial and metric units for your convenience.

Learn how to change Ruler unit in Word, Excel, PowerPoint from default inches to cm, mm, points, picas via Settings, Registry or Group Policy Editor.