John noticed electronic stud finders were often inaccurate, so his simplified tools don’t need batteries or calibration to work. Just run one along a wall, and the indicator will pop up and click. Integrated magnets do a better job locating studs than electronic ones that can struggle with thicker walls found in older homes. StudPoP can detect a metal fastener in a stud through a wall up to half an inch deep. Now hanging things like a mirror, picture frame, or shelves is easier, in any type of space.