Fluke Networks’ Pro3000F filtered probe features a filter that removes signal interference at 50 or 60 HZ and their harmonics. It has a 10-mile range and a loudspeaker that allows toning through drywall.

Platinum Tools’ ToneSeeker TP250C tone tracer probe identifies wire and cable (when used with a analog tone generator) without having to make direct metallic contact with the conductor. It emits a clear tone as a cable is traced, and frequency filtering blocks out background noise.