Only detects metal.
Me and a couple of my friends decided to check out this abandoned house around a mile away. And we decided instead of spending 100$ on a EMF reader, we downloaded this app. At first we were genuinely scared that it was picking up signals going into each room.only to find that when we set the phone down on a metal workbench, it was going off. We took the phone off and on the bench multiple times to find out it somehow detects metal. It’s still a fun app but really doesn’t work properly.