What ended up happening when you used the cheaper stud finders? Did you miss the studs and end up with extra holes in your walls?

Hi, I’m curious how much I should spend on a stud finder. I see them on sale online for anywhere between $1000 and $14. There’s also an iPhone app, which I might try for fun. I don’t do a lot ofDIY but I’m in my 30s and buying more nice furniture and things and it would be nice to hang stuff properly. But I don’t want to shell out for a fancy device if a simple $20 will do the trick.