With steady tone, recessed push-to-scan button, and clear loudspeaker, Tone and Probe Set (P/N TP150) lets user trace and identify cable locations on jacks or through walls. Tapered probe tip facilitates penetration of wire bundles, and thumbwheel probe volume controls volume and turns off power to reserve battery power. Sensitivity of 100 Hz~300 KHz. Tone generator features include slide switch to select TONE/OFF/CONT, continuity mode, alligator clips, and RJ11 connector.