Use Magic Device

The Use Magic Device skill is a class skill for Bards and Rogues, and a cross-class skill for all others. It is a trained only skill, meaning its use can not be attempted without training at least one rank.

In DDO the Use Magic Device skill is used to allow a character to use a wand or scroll without the usual requirement of having the stored spell on said character's spell list. Wands and scrolls that contain a spell already on a character's spell list can be used without fail or skill check as long as the minimum level requirement is met.

Attempting to read a scroll or activate a wand that contains a spell not on a character's spell list triggers a Use Magic Device skill check against the DC of the scroll/wand. The DC of a scroll/wand is 18 plus two times the minimum usage level of the item. A succesful skill check uses up the scroll or a single charge from the wand and unleashes the stored spell effect. A failed check also uses up the scroll or wand charge, but there is no spell effect released.

The DC for wands is 18+(2*Caster Level)

Some example DCs:  

Note that the (6th) in the Wand of Lightning example denotes a higher than normal caster level for the wand. Lightning Bolt is a 3rd level (5th caster level) spell.