Featuring steady tone, push-to-scan button and clear loudspeaker, TP150 Tone and Probe Set lets users trace and identify cable locations on jacks or through walls. Probe, offering 100 Hz~300 KHz sensitivity, has tapered tip for penetration of cable bundles and side thumb wheel that adjusts volume and turns off power. Tone generator includes slide switch to select TONE/OFF/CONT, continuity mode to verify if wire is broken, alligator clips to test pairs, and RJ11 connector for data or phone lines.