This instrument is a multifunctional handheld cable testing tool. Work perfect when RJ11 RJ45 cable is on power. It has a wide application with reinforced cable types and multiple functions. It is a necessary testing tool for telecommunication engineering, wiring engineering, and network maintenance person. _x000D_ _x000D_ Features: _x000D_ Wire tracing Trace RJ11, RJ45, cables or other metal wire (via adapter). Easy and fast to locate the breakpoint without opening the cover of wire. _x000D_ Network cable collation: judge short-circuits, breaking circuit, open circuit and crossing. _x000D_ Test cable level, positive and negative polarity. _x000D_ Status of telephone line checking: test the working status of telephone line (idle, ringing, and off-hook) and judge TIP and RING line. _x000D_ This handheld cable testing tool can check wire continuity. _x000D_ _x000D_ Specification: _x000D_ Brand: BSIDE _x000D_ Model: FWT11 _x000D_ Material: ABS _x000D_ Type: Measuring instruments _x000D_ Primary functions: Wire Line Finder Tracker _x000D_ Scope of application: Education,Home ,appliance,Industrial,Market,Office _x000D_ Operating temperature: 0 - 40, max. 80 %relative humidity (non-condensing) _x000D_ Storage temperature: -10 - 50,max.80 percent relative humidity (non-condensing) _x000D_ Altitude: