The tone generator and probe 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 needs two 9V batteries(NOT INCLUDED) 200EP tone generator wire tracer 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 the network toner and probe kit safer to use, essential tool for electricians 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 destroying insulation! For non-terminated cables, the clamping method can be used for direct measurements as well as for telephone and network line measurements Electric circuit tracer 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. Colour:As Shown Material:Metal Package Contents: 1set * tone generator and probe 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.