Dowsing is a kind of divination where a pendulum or dowsing pole is used by psychics to situate objects or power sources

https://psychiccenterblogx.wpsuo.com/are-psychics-evil-checking-out-the-principles-of-their-talented-talents

Dowsing is a form of divination where a pendulum or dowsing pole is made use of by psychics to find things or energy sources underground.