Product Description: This multifunctional handheld cable tester is a high-quality tool, perfect for telecommunications professionals, wiring engineers, and network maintenance. Designed to efficiently test RJ11, RJ45, and other metal cables (with adapter), it allows for quick fault detection without the need to open the cable's cover. Key Features: Cable Tracing Function: Locates and traces RJ11, RJ45 cables, or other metal wires. Wire Continuity Testing: Detects short circuits, broken circuits, open circuits, and wire crossing. Polarity Testing: Checks line levels, as well as positive and negative polarity of wires. Telephone Line Status Check: Tests the working status of telephone lines (idle, ringing, and off-hook) and verifies TIP and RING connections. Easy to Use: Quickly locates breakpoints without the need to open the wire cover. Compatibility: Works perfectly with live cables (RJ11, RJ45) and other metal wires. This tester is an essential tool for any professional working with networks, cables, or telecommunications, providing fast and accurate solutions.