Ok everyone here is what happened to me I had a screen protector on mine screen and I hit it with the digging knife . If you look in the first picture at the tip of the paper you can see a very very sight dent that was under the screen protector . . So the protector did work . But if you look at the second picture now I have got a big black spot . The detector works fine and in the third picture you can see the icon under the spot so in this area the detector still works great . So do I think a screen protector with (NO) .