Similar to the rod of ages, the Tear of the Goddess/AAstaff/Manamune should display the amount of mana being granted.
I'd like to know when I'm capped.
Tobius the Grand
+1 I'm not sure why they didn't implement it when they added stat tracking for the other items.
© 2014 Riot Games, Inc. All rights reserved. Riot Games, League of Legends and PvP.net are trademarks, services marks, or registered trademarks of Riot Games, Inc.