Edit: Level Meter app works more accurately on my phone, and I recommend it as a replacement to this app (1 March 2013).
Open this app and put your phone on your table, if the green bubble is not in the middle circle then the table is not on a leveled surface, or perhaps your phone is slightly inclined. And if you are facing this app you want to find out where the 45 degrees to your left will be, this is the app for you.
This app is mostly useful for engineers but it might come handy sometimes.
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