Can this device test both HDMI and Ethernet cables?

Yes, the NSS-681HDTV-RJ45 Cable Tester is a 2-in-1 diagnostic tool. It features dedicated ports and a toggle switch to test both 19-pin HDMI cables and standard 8-pin RJ45 network cables, making it highly versatile for AV and IT installations.

Why is the POE anti-burn feature important for network testing?

The POE anti-burn feature protects the tester from being destroyed if you accidentally plug it into a live Power over Ethernet (POE) switch. Basic testers without this protection will instantly short circuit and burn out when exposed to POE voltage.

How do I read the LED indicators to find a faulty cable?

When testing a healthy cable, the LED lights on both the master and remote units will flash sequentially in order (e.g., 1 through 8 for RJ45). If an LED skips a number, that specific wire is broken. If two LEDs light up out of order, the wires are crossed.

Can I buy this HDMI and RJ45 tester in Sham Shui Po today?

Absolutely! Sun Cheong Computer Co. Ltd. keeps a large inventory of professional networking tools and diagnostic equipment. You can order online and pick up your cable tester instantly at our Sham Shui Po physical store during business hours.

What happens if the AAA battery dies while I am on a job site?

This tester features a dual power design! If your AAA battery dies, you can simply use the included USB cable to plug the tester into a portable power bank, laptop, or wall adapter to continue your diagnostic work without interruption.

NSS-681HDTV-RJ45 Diagnostic Tool | HDMI & LAN Wire Checker

Name: NSS-681HDTV-RJ45 Diagnostic Tool | HDMI & LAN Wire Checker
Brand: Sun Cheong Computer Company Limited
SKU: 21TS001896
Price: 413.0 TWD
Availability: InStock

Short Product Description

Troubleshoot display and network issues instantly with the NSS-681HDTV-RJ45 HDMI & RJ45 Cable Tester. This 2-in-1 diagnostic tool checks both 19-pin HDMI cables and 8-pin RJ45 Ethernet wires for short circuits, open circuits, and crossed connections. Featuring POE smart anti-burn protection and a dual power supply (AAA battery or USB), it is the ultimate companion for AV installers and IT technicians. Need a reliable testing tool for your next project? Sun Cheong Computer Co. Ltd. (新昌電腦有限公司) has over 20 years of hardware expertise. Visit our Sham Shui Po physical store for instant pickup and expert advice!

Key Features

2-in-1 Functionality: Tests both high-definition HDMI cables (19 pins + Ground) and RJ45 network cables (8 pins + Ground) with a single device.
POE Anti-Burn Technology: Safely test live Ethernet cables without the risk of burning out the tester's internal motherboard.
Detachable Design: The master and remote units slide apart easily, allowing you to test long cables installed across different rooms.
Sequential LED Indicators: Bright, easy-to-read LEDs quickly identify short circuits, open circuits, and crossed wire configurations.
Dual Power Supply: Operates on a single AAA battery (included) or via an external USB power source for uninterrupted field work.
Compact & Lightweight: Weighing only 120g, this pocket-sized diagnostic tool is perfect for AV installers and IT professionals on the go.

Full Product Description

Professional Cable Diagnostics Made Simple

Stop guessing which cable is faulty with the NSS-681HDTV-RJ45 Cable Tester. Whether you are setting up a home theater system or wiring a new office network, a broken pin or crossed wire can cause hours of frustrating downtime. This 2-in-1 diagnostic device allows you to quickly verify the integrity of both HDMI and RJ45 cables. By observing the sequential LED indicators, you can instantly identify open circuits, short circuits, and miswires before installing cables behind walls or ceilings.

POE Smart Anti-Burn Protection

Test active network lines safely without destroying your diagnostic equipment. Unlike basic testers that fry when plugged into a live Power over Ethernet (POE) switch, this advanced RJ45 and HDMI tester features built-in POE Smart Anti-Burn technology. It automatically protects the internal circuitry from high-voltage damage, ensuring long-lasting durability for professional IT technicians working in live server rooms.

Dual Power Options for Field Work

Never run out of power on the job site with this versatile cable tester. The device features a highly convenient dual power supply system. You can power it using the included single AAA battery for maximum portability, or plug it into a power bank or laptop using the included USB cable via the external power port. This ensures your diagnostic tool is always ready for action, no matter where your project takes you.

💡 Pro Tip from Our Technicians

"When testing long HDMI or LAN cables that are already installed inside walls, always detach the remote unit from the master unit! Simply slide the two halves apart, plug one end of the cable into the master unit, and take the remote unit to the other room to check the LED sequence. If the LEDs do not light up sequentially (1 to 19 for HDMI, 1 to 8 for RJ45), you have a crossed or broken wire. Need to upgrade your networking toolkit? Drop by our Sham Shui Po store! Our team at Sun Cheong Computer Co. Ltd. can help you find the best crimping tools and testers for your specific IT projects."

Technical Specifications

Model: NSS-681HDTV-RJ45
Supported Cables: HDMI (Type A) and RJ45 (Ethernet)
Testing Capabilities: Open circuit, short circuit, crossed wire detection
Protection Feature: POE Smart Anti-Burn
Display Type: Sequential LED Indicators (1-19 for HDMI, 1-8 for RJ45, + Ground)
Power Supply: 1x 1.5V AAA Battery OR External USB Power (50mA)
Dimensions: 94mm x 76mm x 26mm
Weight: 120g
Package Includes: 1x Cable Tester, 1x AAA Battery, 1x USB Cable

Delivery Options

Local delivery within Hong Kong and in-store pickup.
Free shipping for orders of HK$400 or above; HK$35 shipping fee for orders below HK$400.
Shipped by SF Express, usually dispatched the same day for orders confirmed before 6:00 PM (Mon–Sat).
Estimated delivery time: 1–3 business days after dispatch (Hong Kong).
In-store pickup details (location and time) will be confirmed by email or phone message.
Delivery times are estimates and may be affected by weather or unforeseen circumstances.

FAQ Section

Can this device test both HDMI and Ethernet cables?Yes, the NSS-681HDTV-RJ45 Cable Tester is a 2-in-1 diagnostic tool. It features dedicated ports and a toggle switch to test both 19-pin HDMI cables and standard 8-pin RJ45 network cables, making it highly versatile for AV and IT installations.
Why is the POE anti-burn feature important for network testing?The POE anti-burn feature protects the tester from being destroyed if you accidentally plug it into a live Power over Ethernet (POE) switch. Basic testers without this protection will instantly short circuit and burn out when exposed to POE voltage.
How do I read the LED indicators to find a faulty cable?When testing a healthy cable, the LED lights on both the master and remote units will flash sequentially in order (e.g., 1 through 8 for RJ45). If an LED skips a number, that specific wire is broken. If two LEDs light up out of order, the wires are crossed.
Can I buy this HDMI and RJ45 tester in Sham Shui Po today?Absolutely! Sun Cheong Computer Co. Ltd. keeps a large inventory of professional networking tools and diagnostic equipment. You can order online and pick up your cable tester instantly at our Sham Shui Po physical store during business hours.
What happens if the AAA battery dies while I am on a job site?This tester features a dual power design! If your AAA battery dies, you can simply use the included USB cable to plug the tester into a portable power bank, laptop, or wall adapter to continue your diagnostic work without interruption.

Target Users / Applications

AV Installers & Home Theater DIYers: Verifying the integrity of long, expensive HDMI cables before routing them permanently behind drywall or ceilings.
IT Network Administrators: Troubleshooting faulty RJ45 Ethernet connections in live server rooms without fear of POE voltage damaging the tester.
Event Production Crews: Quickly checking display and network cables on stage setups to ensure flawless video and data transmission during live events.