Mr. Reaper has released a new version of the Controller testing app for the Nintendo Wii:
1.1
Added visual feedback for the G Force readings, so you can shake your Wiimote or Nunchuck around furiously to see if the gravity sensors are working in every direction.
1.2
Added a Battery Level indicator to give an idea of how much battery power is left in your Wiimote.
Addressed a bug introduced in the last version which would cause a crash from trying to read gravity sensors if a Wiimote became disconnected. Also, in the event of any crash, I now have it try to exit the app automatically (without needing to press the Reset button), since I have no idea what the code dump screen means anyway!