The innovative TS®54 TDR (Time Domain Reflectometer) is perfect for voice, data and video technicians and communication service provider technicians who need a best-in-class test set. There''s nothing else like the TS54 TDR on the market today. No longer will you need to carry a separate TDR, toner, pair identifier-everything you need is in one newly redesigned and compact test set-that''s a 62% weight reduction and a 20% cost reduction over existing products.The TS54 delivers 20% more extreme weather protection with the latest advancements to our patented RainSafe™, DropSafe™ and DataSafe™ technology. This means the TS54 is weatherproof and rugged and able to butt in on live DSL lines to test POTS quality without crashing data service.