Default [Q] Battery Power Input Widget for Nexus 7

Hi all,

I want to check the power Input to my rooted nexus 7 grouper running 4.2.2. from several chargers/cable combinations to find out why my nexus chagres so slowly...
So Im looking for an app or widget that shows the current power INPUT while charging.

The following widget allows me to do this on the Nexus 5, but Its not compatible with the Nexus 7:

Any tipps?