Depends on what kind of service work you do. We have a huge copper plant in western PA, and a lot of independent telcos who still have a lot of POTS lines serving customers. The Dynatel will perform all the basic tests automatically and it is reliable, however, 3M does not support it and if you need service and can't repair it on your own, you have a nifty boat anchor.
I have had the Triplett for 25 years and it is my go to tester. It's light, does all the relevant tests and it uses components that are easily replaced. I use the Sidekick when I'm working at the coal mines. The copper lines are long and a sidekick will give a quick and dirty line test. You can also blow apart wet bridges and some cable faults to allow time to repair the problem properly. Of all three, the Triplett is my favorite.
Rcaman
