For professionals needing fundamental wire identification tools without costly extras, the 601K-G Tone & Probe Kit is the answer. The 601K-G consists of the 77M-G Tone Generator and the 200B-G Inductive Amplifier, this kit features adjustable volume control, continuity & polarity LED, external warble select and a replaceable tip. The kit can be used on single conductors, twisted pairs, coaxial cables and de-energized electrical wiring. Both units come housed in a polyester zipper pouch.