Used in a new house to test a contractor's subcontractor to install a 20 drop CAT6/5 coax network. The measuring device has more than paid for itself twice as a result of the errors documented in the Fluke round-robin test report. The most pleasant refund on closing from the developer. Then I was able to use the meter to diagnose and fix problems (missing wires, shorts, noise, etc.) in 4 hours.