The SRD says:
Duration: Concentration, up to 10 minutes
For the duration, you sense the presence of magic within 30 feet of you. 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.
However in Solasta only items within 30 feet when the spell is cast are detected.