There are 2 pieces: one the megnet can directly touch the wall.

來源: 於 2013-12-02 14:52:28 [舊帖] [給我悄悄話] 本文已被閱讀：次

This one is good, and using only the magnet side, not the metal side. Another the magnet cannot directly touch the wall, it's not good as a stud finder.