Detect Metal

For the duration, you sense the presence of any metallic objects or creatures within 30 feet of you. If you sense something in this way, you can use a bonus action to pinpoint its location.  You can also use your action to learn what type of metal it is.

You can specify either all metals or one or more specific metals of your choice (such as iron or steel) when you cast this spell; you detect only metal objects or creatures that match your choice.

The spell can penetrate most barriers, but it is blocked by 1 foot of stone, a thin sheet of lead or any metal sensed by the spell, an inch of any other metal, or 3 feet of wood or dirt.