For the duration, you can sense aberrations, celestials, elementals, fey, fiends, undead, poisonous creatures and creatures that cause disease, as well as magic, poison, and disease within 30 feet of you, as well as where the creature or object is located.
If you sense magic in this way, you can use your action to see a faint aura around any visible creature or object in the area that bears magic, and you learn its school of magic, if any.
You can also identify the kind of poison, poisonous creature, disease, or disease causing creature in each case.
Similarly, you know if there is a place or object within 30 feet of you that has been magically consecrated or desecrated.
The spell can penetrate most barriers, but it is blocked by 1 foot of stone, 1 inch of common metal, a thin sheet of lead, or 3 feet of wood or dirt.
* - (divining rod)