I swear by the Franklin Sensors ones, as a dude who hangs TVs on walls for a living. https://www.amazon.com/Franklin-Sensors-FS710PROProSensor-Professional-Finder/dp/B0195K8OT4/ref=sr_1_2?dchild=1&keywords=franklin+sensor+stud+finder&qid=1605060261&sr=8-2