Best Cable Tester Under £100
Whether you are wiring a home network or troubleshooting an office Ethernet line, a reliable cable tester is essential. We have found the best models under £100 that verify continuity, wiring faults, and length without breaking the bank.
Quick answer
The Klein Tools VDV501-851 is the best all-round cable tester under £100, offering wiremap, tone generation, and a rugged build. For sheer value, the iMBAPrice Network Cable Tester delivers accurate continuity testing for under £15.
Why trust ToolBuyerHub
- Tested on specs (power, torque, PSI)
- Battery & ecosystem compared
- Aggregated owner reviews
- Build quality & warranty checked
- Brand reliability
- No fake hands-on claims
Research updated June 2026.
Klein Tools VDV501-851
Professional-grade wiremap and tone for under £100.
| Product | Best For | Key Spec | Rating | Price |
|---|---|---|---|---|
| Klein Tools VDV501-851 | Best Overall | Wiremap + Tone | 4.7/5 | Under £100 |
| iMBAPrice Network Cable Tester | Best Budget | Continuity + Remote | 4.4/5 | Under £15 |
| Fluke Networks TS19 | Best for Professionals | Length Measurement | 4.6/5 | Under £100 |
| Southwire M520 | Best for Coax | Coax + RJ45 | 4.3/5 | Under £50 |
| TRENDnet TC-NT2 | Best for Network Techs | Remote ID #2-8 | 4.2/5 | Under £30 |
Klein Tools VDV501-851
Best OverallPros
- Built-in tone generator for tracing cables
- Rugged overmolded body resists drops
- Tests coax, RJ45, and RJ11
Cons
- No length measurement
- Remote is not numbered for multiple runs
The Klein Tools VDV501-851 is the most versatile cable tester under £100. It combines a wiremap tester with a tone generator, allowing you to both check pin-to-pin continuity and trace cables behind walls. Owner reviews consistently praise its build quality, noting the rubber boot protects it from jobsite drops.
This tester works with RJ45, RJ11, and coax cables, making it suitable for both data and telecom work. The included remote unit lets you test from the far end. While it lacks advanced features like length measurement, its reliability and Klein's limited lifetime warranty make it a top choice.
iMBAPrice Network Cable Tester
Best BudgetPros
- Extremely affordable
- Includes 8 numbered remotes for cable ID
- Simple one-button operation
Cons
- Plastic build feels less durable
- No tone generator
The iMBAPrice Network Cable Tester is the go-to budget option for basic continuity checks. It comes with a main unit and eight numbered remote terminators, allowing you to identify up to eight different cable runs at once. Owner reviews highlight its accuracy for the price, with many using it for home network installations.
It tests RJ45, RJ11, and BNC cables, displaying results via a simple LED sequence. The build is plastic and lightweight, so it is best for occasional use. For under £15, it is a fantastic value for DIYers who need a simple pass/fail test.
Fluke Networks TS19
Best for ProfessionalsPros
- Measures cable length up to 457m
- Built-in tone generator
- Fluke reliability and accuracy
Cons
- No coax testing
- Higher price within budget
The Fluke Networks TS19 is a professional-grade tester that adds length measurement to standard wiremap and tone functions. It can measure cable length up to 457 meters, which is useful for estimating cable runs and locating breaks. Owner reviews from network technicians emphasize its accuracy and Fluke's reputation for durability.
It tests RJ45 and RJ11 cables, and the included remote unit allows for far-end testing. The TS19 is pricier than other options under £100, but its length measurement capability makes it a smart investment for professionals who need more than a simple pass/fail test.
Southwire M520
Best for CoaxPros
- Dedicated coax testing with F-connector
- Rugged overmolded case
- Southwire lifetime warranty
Cons
- No tone generator
- Remote is not numbered
The Southwire M520 is a solid choice for technicians who work with coax cables as often as Ethernet. It provides wiremap testing for RJ45 and RJ11, plus a dedicated coax test port for F-connectors. Owner reviews note its sturdy construction, with the overmolded case surviving jobsite conditions well.
It includes a single remote unit for far-end testing. The lack of a tone generator is a downside for cable tracing, but the coax capability makes it a specialist tool. Southwire's limited lifetime warranty adds peace of mind for long-term use.
TRENDnet TC-NT2
Best for Network TechsPros
- Seven numbered remotes for cable ID
- Auto-scan mode for quick testing
- TRENDnet 3-year warranty
Cons
- No coax support
- No tone generator
The TRENDnet TC-NT2 is designed for network technicians who need to identify multiple cable runs. It comes with a main unit and seven numbered remote terminators, allowing you to test and label up to seven cables at once. Owner reviews appreciate the auto-scan feature that cycles through all remotes automatically.
It tests RJ45 and RJ11 cables only, so it is not suitable for coax. The build is compact and lightweight, making it easy to carry in a tool bag. For network installers who need cable ID without spending much, the TC-NT2 is a practical choice.
What to check before buying a cable tester under £100
Cable types supported: Ensure the tester works with the cables you use. Most testers support RJ45 (Ethernet) and RJ11 (phone), but some also handle coax (F-connector) or BNC. If you work with multiple cable types, choose a tester that covers all of them.
Wiremap vs. continuity: A wiremap tester checks each pin individually and can detect miswires, shorts, and split pairs. Basic continuity testers only check if the circuit is complete. For network cabling, wiremap is essential to ensure proper data transmission.
Tone generator: A built-in tone generator lets you trace cables behind walls or in ceilings by connecting a probe to the tone signal. This is a valuable feature for locating specific cables in a bundle.
Remote units: Some testers include multiple numbered remotes that allow you to test and identify several cables at once. This is useful for patch panels or large installations where you need to label each run.
Build quality and warranty: Look for overmolded cases or rubber boots that protect the tester from drops. Brands like Klein Tools and Southwire offer limited lifetime warranties, while others provide 1-3 year coverage.
Mistakes to avoid when buying a cable tester
Buying a tester that only checks continuity: A simple continuity tester will not detect miswired pairs or split pairs in Ethernet cables. For network cables, always choose a wiremap tester to ensure proper pin-to-pin connections.
Ignoring cable type compatibility: Some testers only work with RJ45 and RJ11. If you need to test coax or BNC cables, verify the tester includes the appropriate ports. Buying a tester that does not support your cables means you will need a second tool.
Overlooking the need for a tone generator: If you install cables in walls or ceilings, a tone generator is invaluable for tracing the cable path. Without it, you may have to rely on visual inspection or trial and error.
Choosing a tester with too few remotes: For jobs with multiple cable runs, having only one remote means you must test each cable individually. A tester with multiple numbered remotes speeds up the process and reduces errors.
Assuming all testers under £100 are the same: Features vary significantly. Some focus on basic continuity, while others include length measurement, tone generation, and multiple remotes. Match the features to your specific needs, not just the price.
FAQs
What is the difference between a continuity tester and a wiremap tester?
A continuity tester only checks if the circuit is complete, while a wiremap tester checks each pin individually and can detect miswires, shorts, and split pairs. For Ethernet cables, a wiremap tester is necessary for proper data transmission.
Can I use a cable tester for both Ethernet and phone cables?
Yes, most cable testers under £100 support both RJ45 (Ethernet) and RJ11 (phone) connectors. Some models also support coax, BNC, or other cable types.
Do I need a tone generator in a cable tester?
A tone generator is useful for tracing cables behind walls or in ceilings. If you install or troubleshoot cables in existing structures, a tone generator saves time. If you only test patch cables, it is less necessary.
How many remote units do I need?
For basic testing, one remote is enough. For jobs with multiple cable runs, a tester with multiple numbered remotes allows you to test and identify several cables at once, speeding up the process.
Can a cable tester measure cable length?
Some testers, like the Fluke Networks TS19, include length measurement. Most basic testers under £100 do not. Length measurement is useful for estimating cable runs and locating breaks.
What does a wiremap test detect?
A wiremap test detects continuity, shorts, miswires, reversed pairs, and split pairs. It displays the pin-to-pin connection status for each conductor in the cable.
Are cheap cable testers accurate?
Yes, budget testers like the iMBAPrice are accurate for basic continuity and wiremap tests. They may lack advanced features and have less durable builds, but their core function is reliable.
What is the best cable tester for coax cables under £100?
The Southwire M520 is the best option for coax testing under £100, as it includes a dedicated F-connector port for coax cables alongside RJ45 and RJ11 support.
How do I test a cable with a remote unit?
Connect the main unit to one end of the cable and the remote unit to the other end. The tester then sends signals through the cable and displays the connection status on the main unit's screen or LEDs.
What warranty should I expect from a cable tester under £100?
Warranties vary from 1 year to limited lifetime. Klein Tools and Southwire offer limited lifetime warranties, while TRENDnet provides 3 years. Check the warranty before purchasing for long-term peace of mind.
Can I test a cable that is already installed in a wall?
Yes, you can test installed cables if you have access to both ends. Use the main unit at one end and the remote at the other. A tone generator helps locate the cable path within the wall.
Is a cable tester useful for DIY home network setup?
Yes, a cable tester is essential for verifying that your Ethernet cables are wired correctly. It helps identify faulty cables or connectors before you finalize the installation, saving time and frustration.
Our verdict
The Klein Tools VDV501-851 is the best overall cable tester under £100, offering a professional-grade wiremap and tone generator in a rugged package. For budget-conscious users, the iMBAPrice Network Cable Tester provides accurate continuity testing at an unbeatable price. Choose the Fluke Networks TS19 if you need length measurement, the Southwire M520 for coax work, or the TRENDnet TC-NT2 for multi-cable identification.