Triplett TDR100 Cable Length Tester and Time Domain Reflectometer

I bought this tester to try to determine where there was a break in the direct burial Cat 6 Ethernet cable. It did help me initially find the first break. However, while repairing the cable I was getting odd reading. I would test from one end of the cable, it would show the cable length as say 50 feet. I would go to the opposite end of the cable and run the same test, where it would show 75 feet. I contacted their support by phone, someone picked up both times. But I had to speak with I believe he was referred to as an engineer. I left my contact info and was told the person will be in touch. The individual called, left a voicemail with his contact info. I tried calling back on at least 3 occasions with no luck in reaching the individual that left the voicemail. I'm sure this testing tool probably does the job, but without any real documentation on how and why you get the results you do, it sure makes it difficult to trust it as a diagnostic tool.

Attempting to use for 75Ohm cable but setting are limited. I was able to get it to work well enough for my situation, if the impedance was more scalable rather than pre selected this would be a much better tool. Fortunately it’s relatively cheap.