Create a mobile that does the graph in the link below:
[url removed, login to view]
I don't care whether you wrap the existing HTML into an App or you create the app from the ground up.
The function used is written on the page.
The only condition is that the data used in the graph must be editable in a config file or something and that selecting a point on the graph will display the values (as it currently does on the HTML version)
No need for fancy stuff, just a simple APK that will be used on 1 tablet.