What about a Revealing Spell? It will reveal all hidden traps in a small area. Higher level spell increases the radius of the area revealed. Though I think this is not worth the slot in your inventory
I think I remember seeing something like this before.
It would be best if it just revealed them for a certain time, and also disabled them for a certain time as well. For example, a level 1 would show them for 1 second, and disable them for like 10(maybe...). The devs would have to balance it out.