I had never used an electronic stud finder before I purchased this particular tool. I took it over to my mom's house because we needed to hang something from the studs. This thing falsed left and right. It never seemed to find a single stud. In the end, I gave up on it.I ended up taking it back and bought a Zircon StudSensor Pro SL. The Zircon had no problem finding a studs. On the first try, it found a stud. Then found the next one, and the next one. It was right every time (I was drilling into the wall). I'm just amazed at how bad the Strait-Line was compared to the Zircon.