app from PocketGear works ok on my scroll. link > http://www.pocketgear.com/uk,en,gbp/270 ... -Test.html
Shows display parameters, multiple touch points, and trails to let you see how linear your touchpanel is. Different hardware supports 1, 2, or more fingers -- see which yours is. Note Android before 2.0 supported only single touch. Please see the help for more info.
