I bought mine, went through the whole set up process, which was a lot more invasive than I was expecting, and downloaded the app. I read the directions a couple times through and watched the tutorial on YouTube a couple of times. I still have not been able to have this "stud finder" produce consistent results. It will act as if I have found the edge of a stud. I sing to my self, "oh joy in Heaven, I am 1/2 way to finding my first stud!" And than, after moving several feet at a slow and steady pace, The other edge of the stud has yet to be found. It is sincerely doubtful that the cheap buggers that put my house together in 1971 framed my closets in with 2' wide framing lumber. It is then fair to assume that this stud finder is in error. I don't have time to second and triple guess whether it truly found the center of a stud , reporting so has proven to be a rare occurrence after several trial runs. I want it to go down the wall and identify studs, boom, boom,boom, so I can get on with my project and it is far too cumbersome to do so. Instead, I sit here wondering if I am truly an idiot and am being defeated by a $20 piece of plastic, or the more likely scenario, this thing doesn't work and was a waste of money, For the cost of this, I could just punch a hole in my closet wall, find the nearest two studs and fix the drywall for less hassle and $$ than I would have using this "tool". That is all I have time for, I have studs to find.