Scrolls: Artificer level 1. Grants a +2 to UMD checks related to scroll use, and all scrolls used by the Artificer have their caster levels increased by 1. This caster level bonus increases by 1 at Artificer levels 4, 7, 10, and 13, and is capped by the Artificer's Intelligence Bonus.
Potions: Artificer OR Alchemist level 2. Grants a +2 to UMD checks related to potion use, if any, and all Admixture spells used by the Artificer/Alchemist have their caster levels increased by 1. This caster level bonus increases by 1 at Artificer/Alchemist levels 5, 8, 11, and 14, and is capped by the Artificer/Alchemist's Intelligence Bonus. This feat also gives damage bonuses to certain infusions.
Also affects some Eternal flasks; for example, it increases the duration of the Freedom of Movement flask.
Wands: Artificer Level 3. Grants a +2 to UMD checks related to wand use, and all wands used by the Artificer have their caster levels increased by 1. This caster level bonus increases by 1 at Artificer levels 6, 9, 12, and 15, and is capped by the Artificer's Intelligence Bonus.
Arms and Armor: Artificer Level 5. Grants a +2 to UMD checks related to weapons, armor, and staves. Any activated abilities on weapons and armor ("clickies") used by the Artificer are cast at a +1 caster level. This caster level bonus increases by 1 at Artificer levels 8, 11, 14, and 17, and is capped by the Artificer's Intelligence Bonus.
Wondrous Items: Artificer Level 7. Grants a +2 to UMD checks related to clothing, jewelry, and trinkets. Any activated abilities on these items ("clickies") used by the Artificer are cast at a +1 caster level. This caster level bonus increases by 1 at Artificer levels 10, 13, 16, and 19, and is capped by the Artificer's Intelligence Bonus.