[High Quality]The tone generator kit is made of high-quality materials, wear-resistant, corrosion-resistant, small in overall weight, and easy to carry. The gain is normal 30dB, input impedance is nominal 100M Ohm, 200EP inductive amplifier. Note: The wire tracker needs two 9V batteries(NOT INCLUDED). [Safety andamp; Widely Used]200EP Tone generator and probe kit with probe are widely used in the maintenance of cables and wires. The measurement area includes line tracking, short circuit test, clear/busy/ringing identification. Insulation probe and built-in loudspeaker can effectively avoid short circuits of conductor and make toner and probe kit to use, essential tool for electricians. [Multi-function andamp; Professional]When used with any tone generator, the professional wire toner probe kit has adjustable volume for identifying and tracking wires or cables within a group without destroying insulation! For non-terminated cables, the clamping can be used for direct measurements as