I'm looking at getting a cable tester to aid me in my job. I'd like to be able to determine if the building is wired properly as well as be able to trace the cables from place to place. (Poking my head into the ceiling and tugging isn't working too well.

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I saw the following 2 that look descent at NewEgg. I was wondering if anybody has any comments or advice for me. I really have no idea how they work, features to look for, or things to look out for. (This is why I'm posting here.

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http://www.newegg.com/app/viewproduc...tester+compuca