OK so I have a phone that's high resolution and on some of these tests I can see lines clearly and others say they don't see! So I compared my phone to my bff who has an iPhone and she said wow pics are so much clearer on your phone then mine! So I think this is why when some tests come up their are some who say they cant see it and others can clearly see them! Just a thought ladies but if you see a line and others may not don't take it personally it may just be the difference resolution!! Just an observation😃💞