Adjustable sensitivity/volume control to increase accuracy Tempo Filter Probe-Inductive Amplifier (200FP) - Zack Electronics Electrician Tool Tempo 200FP-01 - Filter Tone Probe Cable Tracer Probe By selectively filtering out 60Hz (or 50Hz) and its harmonics, the 200FP can be used with any tone generator for faster, more accurate, cable and wire identification Slim, comfortable design for use in limited-space areas 701K-G - Tempo Communications - PROFESSIONAL TONE/PROBE TRACING KIT By selectively filtering out all 60Hz and 60Hz harmonics, the 200FP can be used with any tone generator for faster, more accurate, cable and wire identification