AC Leak Detection
 

How do most A/C shops find leaks (besides using UV dye in the charge) I suspect that the evaporator on my E320 is leaking very slightly, but I do not have the correct tools or know how to check this. When the weather warms up here in WI to the point where I need the A/C again I'd like to know how to thoroughly check the system for leaks.

What tools will I need for the UV dye detection?