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.

Best Ruler & Measurement Android apps 2022 downloads. Below is a little more information on each app, and a direct link for easy downloading. All download links go to the app’s Google Play Store ...

When working in the imperial scale, flipping the ruler in order to move the metric scale out of the way is easy enough. Marking a 45 degree line with the Irwin. Doug Mahoney/NYT Wirecutter.

Wooden rulers used in school, tape measures, slide rulers—all of these typically have equidistant intervals with hash marks (often numbered), used to measure both metric and customized units.