Meter App
This is a nice little application to let you manage meters like gas meters, or electricity meters, for any number or type of meters.
The program computes your consumption averaged on 24 hours for each period. Of course, you need not enter the meter values at fixed hours or periods. You can enter a value at any time.
The meter data are stored in simple CVS (comma separated values) files, which can easily be imported to Excel from the SD card.
The program is available on the market for 1€.