Displays your expected Damage Reduction and Effective HP (EHP) for each of spell resistance type based on the level of the mob being targeted.
Disclaimers:
Only works accurately when targeting mobs with a level greater than or equal to your level.
Don't rely too much on the EHP value. In the grand scheme of things, maximizing damage reduction matters more since it means less healing required to keep you alive.
Unfinished with regards to mobs that are below your level.