You can use your iPad camera to measure nearby objects and surfaces—you can manually set the start and end points of a measurement, have iPad automatically detect the dimensions of rectangular objects, and more.
Go to the Measure app .
Take another measurement, or tap Clear to start over.
To start over on (in the Utilities folder) on your iPad.
Position the dot at the center of the screen along the straight edge of an object until a guide appears.
Tap View and save measurements on iPad