DETECT MAGIC:
The character detect magical auras. The amount of information revealed depends on how long the character studies a particular area or subject:
1st Round: Presence or absence of magical auras.
2nd Round: Number of different magical auras and the strength of the strongest aura.
3rd Round: The strength and location of each aura. If the items or creatures bearing the auras are in line of sight, the character can make Spellcraft skill checks to determine the school of magic involved in each. (Make one check per aura; DC 15 + spell level, or 15 + half caster level for a nonspell effect.)