Here is the SPL meter you want:
http://www.radioshack.com/product/index.jsp?productId=2103667&cp=&kw=spl+meter&parentPage=search
They also make an analog version, which some prefer, but they are hard to find. They may have finally discontinued it for good.
That test cd may have some value but I am not familiar with it. If you want a calibration disc to help you get set up, you should get AVIA or DVE. Amazon sells both and even offers a discount if you buy the two as a package together.