With steady tone and clear loudspeaker, Tone and Probe Set (P/N TP150) can trace and identify cable locations on jacks or through walls. Pushbutton activates tone scanning, tapered probe tip penetrates wire bundles, and probe volume is controlled via side thumbwheel. Along with 100 Hz to 300 KHz sensitivity, features include tone generator with slide switch to select TONE/OFF/CONT, continuity mode to verify broken wire, alligator clips to test pairs, and RJ11 connector for data or phone lines.