Multi-function, small and portable wire rope measuring instrument, compact size, convenient to carry The cable tester helps quickly identify required line pairs among multiple cables. Compatible with RJ45 network cable terminals and RJ11 telephone line terminals, capable of testing 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 Suitable for tracking wires, surge protection, and data transmission applications with stable performance. Ideal for use in 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, crossover connections, and cable type verification Product Description Cable tester with cable continuity detection and polarity identification. Compatible with RJ45 network cable terminals and RJ11 telephone line terminals Features Nylon hook for secure attachment - Color: Blue - Material: ABS plastic - Dimensions: 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 Protection rating: IP40 Signal transmission distance: approximately 300m