Review on 🔍 Efficient and Reliable: 6 Pack Stanley 47-400 Magnetic Stud Finder for Easy Wall Stud Detection by Kenny Sarma

This is a reliable tool. What he actually finds is a nail or screw that was previously on the shelf. Using a finishing nail, I then feel the area of the "found" nail to determine exactly where the stud begins and ends. Finding the center of the stud is very important when hanging something heavy like a cabinet or TV. Simply place it on the surface of the drywall and move slowly and in an organized manner. When you go over the nail you will hear a click or see a small yellow switch move. I've had one of these for 30 years and it works great. I bought more to give to my jealous friends. This item is not designed to "stick" to anything. All he does is find the nails that attach the drywall to the studs. From this you conclude that the hairpin is under the nail. No electronics or batteries to wear out. That's great. (I used to buy one of those expensive electronic devices, but it always showed the wrong tip position.)