Features: High precision The cable tester has optional continuous or adjustable generator. It is easy to use and it can offer high precision test results, very suitable for circuit testing. Safe With built-in speaker tube and insulation probe, the detector finder can effectively prevent from short circuit of conductor, making it safer when using. Widely used The tone generator kit has multiple purposes. It can be used for line tracking, short circuit testing, clear, busy, ringing identification. In addition, the clamp mode can be directly applied for telephone and network line measurement. Battery The wire tracer requires 2*9V battery (not included). It is convenient to install or change battery. The tester has good performance and will bring great convenient for maintenance. Premium material The cable tester is made of selected materials that are wear resistant and erosion resistant. It is durable and has long service life. Specifications: Item type: cable tester Material: plastic Color: white Gain: nominal 30dB Input impedance: 100M ohm nominal Probe tip resistance (minimum): 0 Ohm (metal tip) 300 Ohm (plastic tip) Battery: 2*9V battery (not included) Temperature: 0-50 degrees Celsius/ 32-122 degrees Fahrenheit Item size: 23.1*5.5*2.8cm/9.08*2.16*1.10inch(L*W*H) Weight: 320g/11.29oz