This product saved me a lot of money and time. I had a frustrating coax problem that was occurring intermittently on a 400 foot stretch of underground cable. The Fluke TS-90 helped me pinpoint the problem to within 10 feet, the reading fluctuated, likely due to varying moisture conditions in the cable. I bought a Fluke Pro3000 toner and probe to troubleshoot the problem more precisely, but that didn't help. Using the initial TC-90 location instructions, I went to the nearest old cable splice; I re-spliced and resealed the wire connection and the problem was completely gone. I am very happy with the TS-90 because I was able to find a cable problem without multiple cable digs or splices.