Industry standard way of testing websites on various devices?

[backitupt]

I am essentially looking for the BrowserLab of Devices. What would the normal process be for a big design agency to ensure that their websites look the same across a wide array of the standard devices? The Nexus, iPad 1,2 and 3, so on and so forth.Edit: I was hoping for answers that didnt involve breaking the bank and buying every device under the sun.