This app shows charging current when charging, and discharging current only when the screen is on while discharging.
It also shows the charging/discharging rate in percentage, with screen on time while discharging since last unplugged.

It helps to check whether the charging cable and adapter are working as expected.

Every value resets whenever charging state is changed.
The average while discharging is the average of values when screen is on.

If you want to give any feedback, please report it here: http://forum.xda-developers.com/android/apps-games/electron-measure-charge-discharge-speeds-t3400978 or send us an email to the email address given below