Where can I find my device info? Disclaimer: I am not looking for the "General > About device" information.

I am trying to look for the information about the performance, RAM, screen size/dpi for my device, so that  I can create an emulator for app development.
There are pretty much good app in Google play you can take help from there , search for hardware information or device information application will make your work. 

I prefer one of my best app - CPU Z. 

Hope it helps.