Detect Flagon

For the duration, the caster can sense the presence of every flagon, glass, tankard, glass, and similar drinking vessel within 30 feet. The range becomes 100 feet when cast by a dwarf or a deep gnome. If you sense a drinking vessel of any kind in this way, you can use your action to learn if it is empty or holds an alcoholic beverage.

The spell can penetrate most barriers, but is blocked by 1 foot of stone, 1 inch of common metal, a thin sheet of lead, or 3 feet of wood or dirt.