What will you be using it for? If you just want to know how much cable is left on a spool or for drop work Victors Tdr is fine, If youre doing any UG repair go with the TV 90 Cable Scout. It has a graph display that will show multiple shorts & you can set it up for specefic cable types. Riser bond 1550 is also a good tdr for UG but I like the TV 90 better.
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