You are magically sensitive. This is basic “magical awareness,” a prerequisite for learning magic. The GM makes a Sense roll when you first see a magic item, and again when you first touch it. On a success, you intuitively know that the item is magical. A roll of 3 or 4 also tells you whether the magic is helpful or dangerous, and about how strong it is. Those without Magery do not get this roll!
Unlike Magery 1+, you can't put any enhancements or limitations on Magery 0.