[ ]The tone generator kit is wear-, -, 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 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 , 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 wires or cables within a group without insulation! For non-terminated cables, the clamping method can be used for direct measurements as well as for telephone and network line measurements. [Accurate andamp; Easy]Wire toner has spring-loaded ON/OFF button, easy and convenient to operate; Same group cable is recognized in only 1 second; With optional continuous or adjustable generator, the method is simple and the test results are accurate. Comes with an instruction manual, detailed and easy to understand. Convenient to carry and storage the cable with carrying bag, and protect it from demage, makes it . Material: plastic colour: As shown Package Contents: 1 x Tone Generator Kit Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.