This article covers LANケーブルテスター YOJOCK RJ-45(LANケーブル).
Overview
The YOJOCK RJ-45/RJ-11 LAN Cable Tester is a compact, affordable continuity checker designed for network cable installation and troubleshooting. It features a detachable remote unit, allowing you to test cables that are already installed in walls or ceilings. With two speed modes (high/low) for the LED scan, you can quickly verify wiring correctness. This tester supports RJ-45 UTP/STP cables (EIA/TIA-568A and 568B wiring) and RJ-11 modular cables. It is battery-powered (2x AAA, not included) and comes in a black color, with a remote unit included. The price is around ¥1,700, making it a budget-friendly tool for DIY network maintenance.
Connectivity & Compatibility
RJ-45 connector: Tests all 8 pins for continuity and mis-wiring. Compatible with straight-through, crossover, and other standard wiring schemes. Works with both UTP and STP cables. RJ-11 connector: Tests 6P4C or 6P2C modular cables, commonly used for telephone lines or older DSL connections. Detachable remote unit allows testing of cables up to practical lengths (approximately 100 meters). No additional adapters required. Simple plug-and-test operation: insert the cable into the main unit and the remote unit, then power on and observe the LED indicators.
Product Info
Released in late 2025, the YOJOCK LAN Cable Tester is priced at roughly ¥1,700. It comes with the main unit and remote unit only; batteries are sold separately. Warranty is typically 90 days through the seller (). Market positioning: Entry-level cable tester. Offers basic continuity checking for individual users and small-scale network work. While it lacks advanced certification features, it provides excellent value for its price.
Best Use Cases
DIY home network installers: After running cables through walls or terminating keystone jacks, use this tester to verify pin-to-pin continuity. The low cost makes it a no-brainer for anyone doing their own wiring. Small office LAN maintenance: Quickly check for broken or mis-wired cables in a small office environment. The high-speed mode helps speed up repetitive testing. Remote workers setting up a wired network: If you're extending your home network with new cables, this tester ensures everything is connected correctly before you spend time troubleshooting connection issues. Not for: Professional cable certification (e.g., Category 6A performance testing) requires a much more expensive tester that can measure crosstalk, return loss, etc. This product is only for continuity checks.
Things to Consider
This tester only checks continuity, not signal quality. It cannot detect crosstalk, attenuation, or other performance issues that can affect high-speed data transmission. No batteries included – you need to purchase 2x AAA batteries separately. The remote unit is small and can be easily lost. Keep it attached to the main unit when not in use. The tester cannot test both RJ-45 and RJ-11 cables simultaneously; you must manually switch between them. ## FAQ
Q: Can I test STP (shielded) cables with this tester? A: Yes, RJ-45 STP cables are supported. However, it only checks the signal pins; shield continuity is not tested. Q: What is the maximum cable length I can test? A: The manufacturer does not specify a maximum length, but in practice it works well at common LAN distances (up to 100 meters). LED brightness may decrease over longer distances. Q: Can it detect wiring errors like swapped pairs? A: Yes, the tester shows each pin's continuity via LEDs, so you can identify mis-wiring (e.g., pin 1 connected to pin 2). You'll need to interpret the LED pattern to determine which pins are swapped.
