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If you work with PLCs, HMIs, industrial Ethernet, control panels, network switches, cameras, routers, or machine communication, a network cable tester is a very useful tool.
A bad Ethernet cable can create very annoying faults.
The PLC may lose connection.
The HMI may stop communicating.
A VFD may disappear from the network.
A remote I/O station may randomly drop out.
And sometimes the problem is not the PLC, not the switch, not the drive — it is just a bad cable.
A network cable tester helps you check things like:
Cable continuity
Wrong wiring order
Open wires
Short circuits
Crossed pairs
Cable length
Cable tracing
PoE presence
RJ45 connector problems
Broken Ethernet cables
Below are 5 Amazon network cable testers I would consider, from cheap beginner options to professional tools.
Important Note Before Buying
A basic network cable tester can check if the wires are connected correctly, but it does not fully certify an industrial Ethernet installation.
For serious PROFINET, EtherNet/IP, Modbus TCP, or factory network work, you may need a more advanced tester.
But for everyday troubleshooting, even a simple tester can save a lot of time.
1. iMBAPrice RJ45 Network Cable Tester — Best Cheap Starter Option
Best for: beginners, basic cable checks, simple RJ45 testing
Affiliate link: [iMBAPrice – RJ45 Network Cable Tester ]
The iMBAPrice RJ45 Network Cable Tester is a very simple and cheap option for checking network cables.
The Amazon listing describes it as a tester for RJ45, RJ11, RJ12, CAT5, CAT6, CAT7, and UTP wire testing.
Why I Recommend It
I recommend this one only as a basic beginner tool.
If you are learning Ethernet wiring, RJ45 connectors, or simple network troubleshooting, this type of tester is enough to start.
It is useful for:
Checking basic RJ45 cables
Finding wrong pin order
Testing short patch cables
Learning network cable wiring
Simple home or workshop use
Beginner PLC training setups
For the price, it is a nice first tool.
Main Weakness
It is basic.
It will not give you advanced diagnostics, cable length, PoE information, or professional troubleshooting features.
But if you just want to know whether a cable is wired correctly, it can do the job.
2. Klein Tools LAN Scout Jr. 2 VDV526-200 — Best Simple Electrician Option
Best for: electricians, maintenance beginners, RJ45 cable testing
Affiliate link: [Klein Tools VDV526-200 Cable Tester]
The Klein Tools LAN Scout Jr. 2 is a better option if you want a simple but more trusted cable tester.
The Amazon listing says it tests installed or loose CAT5e, CAT6, and CAT6A cables with RJ45 connectors. It also has tone generation with multiple tone frequencies and a backlit display for easier reading in low-light areas.
Why I Recommend It
I like this one because it is simple, compact, and more suitable for real electrical work than the cheapest no-name testers.
It is good for:
Electricians
Maintenance technicians
Basic Ethernet cable checks
PLC cabinet network cables
HMI cable troubleshooting
Patch cable testing
Control panel wiring checks
If you are working around industrial panels and want a simple RJ45 tester, this is a good step up.
Main Weakness
It is still not a full advanced network analyzer.
It is better for checking cable wiring and basic faults than diagnosing complex network problems.
3. NOYAFA NF-8209 Network Cable Tester — Best Value With Tracing and PoE Features
Best for: cable tracing, PoE checks, Ethernet troubleshooting
Affiliate link: [NOYAFA NF-8209 Network Cable Tester]
The NOYAFA NF-8209 is a more feature-rich option for the money.
The Amazon listing describes it as an Ethernet cable tester with PoE and NCV functions for CAT5/CAT6 cable tracing, length testing, RJ45 testing, and telephone line finding. Another Amazon listing mentions cable continuity testing, cable length measurement, and fault distance location for CAT5e, CAT6, and CAT6A cables.
Why I Recommend It
This one is interesting because it gives more features than a basic wiremap tester.
It can be useful for:
Tracing cables in panels
Finding which cable goes where
Checking Ethernet continuity
Testing cable length
Checking PoE situations
Finding cable faults
General network troubleshooting
For automation technicians, cable tracing can be very useful. In real panels, cables are not always labeled well, and sometimes you need to find where a cable actually goes.
Main Weakness
It is still a budget-to-mid option.
For professional industrial network work, I would trust Klein or Fluke more. But for the features and price, it can be a very useful tool.
4. Klein Tools Scout Pro 3 VDV501-851 — Best Mid-Range Professional Choice
Best for: electricians, panel builders, maintenance technicians
Affiliate link: [Klein Tools VDV501-851 Cable Tester Kit]
The Klein Tools Scout Pro 3 VDV501-851 is a strong mid-range option.
The Amazon listing describes it as a versatile cable tester that locates and tests voice, data, and video cables. It includes location mapping remotes, verifies cable installations, and has a backlit display for low-light areas.
Another Scout Pro 3 kit listing says it can identify multiple cable runs with 18 location mapping remotes, test PoE, and measure cable length.
Why I Recommend It
I recommend this one if you want a more serious cable tester for electrical and automation work.
It is good for:
PLC panels
Control cabinets
Network switches
Patch panels
Machine wiring
Electrical contractors
Maintenance technicians
Multiple cable run identification
The mapping remotes are useful when you have many cables and need to identify where each one goes.
This is very common in control cabinets, server racks, machine panels, and building networks.
Main Weakness
It costs more than simple testers.
If you only test one cable occasionally, it may be more than you need. But if you work with many cables, it saves time.
5. Fluke Networks MS2-100 MicroScanner2 — Best Professional Choice
Best for: professional network troubleshooting, industrial maintenance, serious cable diagnostics
Affiliate link: [Fluke Networks MS2-100 MicroScanner2]
The Fluke Networks MS2-100 MicroScanner2 is the professional option on this list.
The Amazon listing describes it as a copper cable verifier with built-in IntelliTone toning. It is made for RJ11, RJ45, and coax troubleshooting and supports 10/100/1000Base-T and VoIP testing.
Another Amazon listing for the MicroScanner2 kit says it performs continuity tests on all wires in a few seconds and displays results graphically.
Why I Recommend It
This is the one I would choose for serious professional work.
Fluke Networks tools are expensive, but they are trusted for cable and network troubleshooting.
It is useful for:
Industrial Ethernet troubleshooting
PLC and HMI network checks
Patch panel testing
RJ45 cable diagnostics
Coax testing
Cable tracing
Professional maintenance work
Network installation verification
If you work with Ethernet faults often, a professional tester can save a lot of time.
Main Weakness
The price.
For beginners, it is expensive. But for professionals who troubleshoot networks regularly, it can be worth it.
My Final Recommendation
If you want the cheapest option, I would choose the iMBAPrice RJ45 Network Cable Tester.
If you want a better simple tester from a trusted brand, I would choose the Klein Tools LAN Scout Jr. 2.
If you want more features like tracing, PoE, and cable length testing without spending too much, I would look at the NOYAFA NF-8209.
If you want a strong mid-range professional option, I would choose the Klein Tools Scout Pro 3.
If you want the best professional tester, I would choose the Fluke Networks MicroScanner2.
My personal pick for most automation technicians and electricians would be the Klein Tools Scout Pro 3, because it gives a good balance between features, brand trust, and practical cable troubleshooting.
For professional network troubleshooting, I would choose the Fluke Networks MicroScanner2.
What to Look for When Buying a Network Cable Tester
When choosing a network cable tester, check:
RJ45 support
CAT5e / CAT6 / CAT6A support
Wiremap testing
Open and short detection
Crossed pair detection
Cable length measurement
Cable tracing / tone generator
PoE detection
Remote identifiers
Backlit display
Coax support if needed
Telephone cable support if needed
Build quality
Replacement remotes
Trusted brand
For PLC and automation work, I would especially look for cable tracing, wiremap testing, and cable length / fault distance features.
Why Network Cable Testers Are Worth Buying
Industrial Ethernet problems can be frustrating.
A machine may stop communicating because of one badly crimped RJ45 connector, one broken conductor, one swapped pair, or one damaged cable inside a cabinet.
Without a tester, you may waste time blaming the PLC, HMI, switch, VFD, or remote I/O.
With a tester, you can quickly check the cable first.
That is why I think a network cable tester is a must-have tool for automation technicians, electricians, maintenance workers, and PLC learners.