Does anyone out there certify pool bonding and grounding? If so, (Just out of curiosity) what kind of tester is used? I heard that there are several types of testers, but don't know which ones are used. Someone also told me that you need a length of #8 copper that is tested to show same exact resistance for each test. I also heard that the type of meter used puts out a small amount of voltage while it is being used for the test. Thanks!