It seems this question wasn’t reasonably addressed

Apple_thom wrote:

In the Measure App I can use the Level feature to measure Flat surface.

How it can be possible if there is a small BUMP caused by the back Camera lenses ?

So the iPhone’s back is not a flat surface.

Thanks.

so how can this bump be irrelevant ? Either the app takes it into account or you have to place the phone in such a way the camera bump out isn’t on the surface you are leveling.

man’s yes there are two different ways of leveling. One on the phones side and one on its back with the screen facing up.

I don't understand your question? The measure app uses Augmented Reality to in essence act as a tape measure. I don't understand what the camera bump on the back of your iPhone has to do with using the feature to measure the length of something else?

Read this from Apple about using the Measure app --> Use the Measure app on your iPhone, iPad, or iPod touch - Apple Support

Probably you are referring to Level Tab in the Measure App. Have you tried using the level or it is just your hunch.

In the aboe pic where is the Camera hindarrance?

Use your iPhone to determine whether an object near you is level, straight, or flat (measurements are approximate). Open Measure. Tap Level, then hold iPhone against an object, such as a picture frame.Make an object level: Rotate the object and iPhone until you see green.

Use iPhone as a level - Apple Support (IN)