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If it's a wand, then it has a flat DC 20 UMD check.
If it's a scroll it's a bit more complicated. First there's a UMD check with DC = 20+caster level. A typical 2nd level wizard scroll will have CL 3, so the DC will be 23. Next you must meet the requisite ability score modifier, which in this case is 12. Since almost all wizard spells are also sorcerer spells, you can use either intelligence or charisma. If your charisma score is high enough then you don't need to make further checks. If not, you must make a check of DC 27 (15 + the score you need) to emulate the ability score.