It's not 100% accurate right now (the keyboard below is actually about 17 inches) but hopefully, things will get better in subsequent updates. More Info: How to Measure Real-World Objects with Your iPhone in iOS 12 PS: The "Level" previously in the Compass app has been moved to ...
The Safari Developer Tools for the macOS browser can be enabled and displayed inSafari > Preferences > Advanced> “Show Develop menu in menu bar” for Safari version 14 and earlier. Then from the Safari “Develop” menu select “Show Web Inspector” or use the keyboardshortcutOption+Command+i...