Finally, I know these aren't "hand tools" but a good line test set is really a life saver. I have a Sidekick, a Triplet Model 5 and a Dynatel 965.
Funny you mention the Dynatel 965... after ajkula66 posted that you could pick up a Sidekick inexpensively on eBay, I got to browsing around and found a Dynatel for ~$100 and was wondering if it was worth checking out. Same seller had a Sidekick and a Sunrise Sundown xDSL pretty reasonably priced so I was kicking it all around. Looks like the Triplett can be had pretty inexpensively too... If you were going to just get one (or maybe two!
), which would you go for?