Not all iPhone owners know that the standard set of iOS 12 applications has a useful and fairly accurate measurement program.
With it, you can quickly find out the size of any object.
How to know the size of the subject
1. Run the Measure application .
2. In the measurement mode, we point the camera at the desired object. For accurate measurement you need good lighting or a contrasting background.
3. When the camera captures the object, we remove the central marker from the center of the object.
4. Click on the center of the object and see the size card.
The chip works on devices starting with iPhone 6s , iPad 2017 , iPad Pro and newer models.