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Another option is to get a camera lens detector device. It works by detecting the curvature of camera lens.

How does it detect the curvature?

I think it probably measures the curvature and if the curvature exceeds the normal parameters of non-lens objects then the device has curvature and can be detected.

>> How does it measure the curvature

> ... it probalby measure the curvature

So how does it measure the curvature?

You just pop it on your wrist.

Edit: I wonder if anyone will get the reference

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