This application allows to detect exact screen density and screen category info. It shows which drawable folder is chosen by Android OS.
Last time, I had a (cheap) tablet with atipical screen density. I've prepared this tool to detect which drawable folder is chosen by Android OS. In this particular case they were taken from TVDPI but they were also scaled (100x100 pixels was scaled to 91x91..)
I hope this tool can be useful to you.