Multi-function, small and portable wire rope measuring instrument, compact in size, convenient to carry The cable tester helps quickly identify required line pairs among multiple cables. Compatible with RJ45 network cable connectors and RJ11 telephone line connectors. Can test other metal wires using an adapter Cable tester for measuring cables, detecting cable continuity, and identifying positive and negative polarity. Polarity testing is performed via the transmitter Features signal tracing, surge protection, and data transmission stability. Suitable for engineering telephone networks, computer networks, and other systems using metal wiring Toner and Ethernet LAN network tester for checking network cable status, including open circuit, short circuit, miswiring, crossed pairs, and cable type identification Description Cable tester with cable continuity detection and polarity identification. Compatible with RJ45 and RJ11 connectors Features - Blue color - Material: ABS plastic - Size: 2.36 x 4.96 inches; 8.07 x 1.57 inches Storage temperature: -10°C to 50°C, maximum relative humidity 80% (non-condensing, without battery) Altitude: <2000m Ingress protection rating: IP40 Signal transmission distance: approximately 300m