Hi! I bought a multimeter from Radio Shack:http://www.radioshack.com/product.as...%5Fid=22%2D809 I read some instructions on how to test that that my equipment is wired correctly (correct polarity) but now that I bought the multimeter I can't find the article! Can someone please explain me? I think I had to test the connection that has the lower noise level (lower readings?) ...any help on how to do it will be aprecciated.