Occasionally scans target's magic resistances. Ice x 1
As of the December 2006 update, the Scanner now works like the description says, and causes the automaton to attempt to cast nukes based on a mob's elemental weakness, if any.
Scanner can also stop your auto from doing anything accept enfeeble during some HNM fights with high magic resistance. This may be prevented if your magic skill is high enough.
"In order for your trusty automaton to determine enemies' resistances, it's not enough to just equip a scanner! Try using an ice maneuver after equipping a scanner."
So says the devs.
Source:http://forum.square-enix.com/ffxi/threads/28928-Intelligent-Casting-Attachment
