Because the nature of traps can vary, a wide range of equipment might conceivably be helpful on different occasions; a magnifying glass, for example, might help with concealed traps. There are many items for which a DM might allow a +5% modifier to the find/remove traps roll. This needs a DM decision on a case-by-case basis. There is one exception: lockpicks, which are important in a wide range of cases.
Lockpicks[]
These may be considered as necessary for discovering small traps which are affixed to locks. Without them, the thief cannot use his find traps skill nor his remove traps skill for dealing with such traps. Improvised lockpicks have a -30 penalty to both skill rolls. The kind of traps involved here are small poisoned needles inside drawers or coffers; spring-triggered poison dart traps inside containers; and so on.