The ptx cable tester is a useful tool to check your data cables. It examines every single conductor of the data cable seperately. Eight LEDs let you know if any conductor is broken, shorted or swapped with another conductor. In addition to that, the cable tester lets you test the following cable types: Speakon, RJ45, RCA, Midi, XLR5, XLR3, 6.5mm Jack, single line via included test prod