KleinTools RJ45 Review: How Does Pass-Thru Technology Simplify Network Terminations?
This review examines the KleinTools RJ45 Cable Tester Kit, a professional-grade set combining the LAN Scout Jr. 2 tester, an all-in-one crimper/stripper/cutter, and Pass-Thru modular plugs for reliable network cable installation and troubleshooting.
By Elvis Dicki
Updated October 22, 2026
For network professionals and dedicated IT enthusiasts, ensuring reliable cable terminations and quick fault diagnosis is a fundamental task. The KleinTools RJ45 Cable Tester Kit, officially the Klein Tools 80072, presents itself as a comprehensive solution designed to streamline this process. This three-piece kit bundles a cable tester, a multi-function crimping tool, and a pack of specialized connectors, aiming to cover the core needs of installing and verifying data cabling. It targets those working with CAT5e, CAT6, and CAT6A networks, from telecom technicians to system integrators setting up office infrastructure.
At its core, the kit is built to reduce troubleshooting time and improve the accuracy of connector installations. The bottom line is that this kit consolidates essential tools for network cable work into a single, professionally-oriented package, emphasizing visual verification and reliable testing to ensure network performance.
Prime Klein Tools 80072 RJ45 Cable Tester Kit LAN Scout
As an Amazon Associate we earn from qualifying purchases. Product prices and availability are accurate as of the date/time indicated.
KleinTools RJ45 at a Glance
| Specification | Detail |
|---|---|
| Kit Name | Klein Tools 80072 RJ45 Cable Tester Kit |
| Primary Components | LAN Scout Jr. 2 Cable Tester, Coax Crimper/Stripper/Cutter, 50-Pack Pass-Thru Modular Plugs |
| Key Tester Function | Tests CAT5e, CAT6, CAT6A cables terminated with RJ45 connectors |
| Display | Large backlit LCD for wiremap results |
| Fault Detection | Open, short, miswire, split-pair, cross-over, and shield |
| Crimper Compatibility | RJ11, RJ12 standard, and RJ45 Pass-Thru connectors |
| Tool Functions | Wire stripping, crimping, and cutting |
| Brand Heritage | American manufacturer with over 160 years in professional tools |
| Specific Uses | Networking, telecommunications, IT infrastructure setups |
| Included Components | Coax Cable Crimper / Wire Stripper / Wire Cutter, LAN Scout Jr. 2 Cable Tester, Pass-Thru modular plugs |
Design and Build
The KleinTools RJ45 kit embodies the brand’s reputation for durable, professional-grade equipment. The tools feature a distinctive yellow and black color scheme common to the Klein lineup. The crimper/stripper/cutter tool is constructed with stainless steel and includes rubberized, ergonomic grips designed for comfort during repetitive use. This all-in-one tool consolidates three separate functions, which is a space-saving design choice for a field kit.
The LAN Scout Jr. 2 tester is a compact, handheld unit built for portability. Its design centers on the large backlit LCD screen, a critical feature for visibility in poorly lit server rooms, crawl spaces, or ceiling plenums where network work often occurs. The overall kit packaging is designed for organization and transport, though specific details about a carrying case are not listed by the manufacturer. The build quality aligns with the expectation of tools meant to withstand daily jobsite demands.
Performance and Features
Cable Testing Capabilities
The heart of the kit’s diagnostic power is the LAN Scout Jr. 2 Cable Tester. It is designed to test both installed permanent links and loose patch cords terminated with RJ45 connectors. It supports modern cable standards, including CAT5e, CAT6, and CAT6A. The tester performs a pin-to-pin wiremap, displaying the results clearly on its backlit screen. This allows users to quickly verify correct wiring sequences.
Beyond simple continuity, its versatility shines in fault detection. It can identify opens (broken connections), shorts (unwanted connections), miswires (incorrect pin assignments), and the more subtle split-pair faults that can degrade network performance despite showing correct continuity. It also tests for cross-over cables and checks shield continuity on shielded cables, providing a thorough pre-deployment check for both voice and data applications.
Crimping and Termination System
The included Coax Cable Crimper / Wire Stripper / Wire Cutter is a premium, multi-purpose tool. It handles the stripping, cutting, and crimping processes for paired-conductor data cables. Its key performance feature is compatibility with both standard RJ11/RJ12 connectors and the Klein exclusive Pass-Thru RJ45 connectors included in the kit.
The Pass-Thru technology is a significant feature. Unlike traditional connectors where wires must be cut to an exact length before insertion, Pass-Thru plugs allow the trimmed ends of the conductors to pass through the connector. This enables visual verification that all wires are correctly seated and in order before the final crimp, which is then designed to cleanly shear off the excess wire. This process aims to reduce prep work time and increase reliability, especially for those who may not terminate cables daily.
Kit Integration and Value
The performance of this kit is rooted in its integration. Having a matched tester and crimper designed to work with the same Pass-Thru connectors creates a cohesive workflow. The manufacturer positions it as a “SMART BUY,” a complete kit that offers convenience and value by bundling high-performance, complementary tools. The 50-pack of Pass-Thru modular data plugs provides a immediate supply of consumables, allowing users to start projects right away. The kit is focused specifically on RJ45 data cabling and related connectors, providing deep capability within that scope.
Setup, Support and Ownership
Setup is straightforward, as the kit includes the core tools needed to begin testing and making cables. No assembly is required for the tester or crimper. However, effectively using the Pass-Thru termination technique may require an initial learning period or practice to achieve optimal, reliable results compared to standard connectors. The kit does not include practice test cables or other accessories like a cable stripper separate from the crimper, so those would need to be sourced separately if desired.
Klein Tools is an established American manufacturer with a long history in professional hand tools, which suggests a commitment to product support. The product information mentions a warranty document is included, though the specific terms and duration are not detailed in the provided data. Ownership is supported by the brand’s widespread availability and reputation within the trades. For those seeking to expand their capabilities, this kit serves as a focused foundation; support for other connector types like RJ48 or fiber would require additional, separate tools not included here.
What Owners Say
Owner feedback for the KleinTools RJ45 kit is overwhelmingly positive, reflected in its high average rating. The rating distribution shows the vast majority of reviews are at the highest level, with a very small percentage of lower scores. Users frequently describe it as “everything you need for making network cables,” praising its versatility and ease of use for both professionals and DIYers.
Many reviews highlight the LAN Scout Jr. 2 tester for being compact, accurate, and saving significant troubleshooting time by quickly identifying wiring issues. The crimping tool, specifically its ratcheting mechanism, receives consistent praise for building reliable connections, with owners noting they haven’t had a bad cable since using it. The quality and sturdiness of the tools are common themes, with users calling them “strong and sturdy” and “excellent.” The consensus among owners is that it is a reliable, professional-grade kit that delivers on its promises for network cable installation and verification.
Pros and Cons
Pros
- Complete all-in-one kit for testing and termination
- Pass-Thru connector design allows for visual wire verification
- Accurate and versatile cable fault detection
- Backlit LCD display for low-light work areas
- Durable, professional-grade build quality
- Ratcheting crimper promotes reliable connections
Cons
- Pass-Thru technique may require practice for new users
- Focused exclusively on RJ45 and related data/voice connectors
- Does not include practice cables or additional accessories
- Specific warranty terms are not detailed in the provided data
Who Should Buy It (and Who Should Skip It)
This kit is an excellent fit for network technicians, IT professionals, telecom installers, and system integrators who regularly install or troubleshoot CAT5e/6/6A cabling. It is equally suitable for serious DIYers or small business owners who want professional-grade reliability for their own network infrastructure projects. The value of having a matched, high-quality tester and crimper in one package is significant for anyone who needs to ensure network reliability and reduce downtime caused by cabling faults.
Those who should consider alternatives include users who only very occasionally make a cable and might find a simpler, less expensive tester and basic crimper sufficient. Individuals needing to test or terminate a wide variety of cable types beyond standard RJ45 data cables (such as extensive coaxial work or fiber optics) will find this kit’s scope too narrow. For more general insights on essential tech tools, explore our Tech Gear section.
Final Verdict
The KleinTools RJ45 Cable Tester Kit delivers a focused, professional-grade solution for a specific and critical task. Its strength lies in the thoughtful integration of its three components: a capable and clear tester, a robust multi-function crimper, and the time-saving Pass-Thru connectors. The design prioritizes accuracy, durability, and workflow efficiency, which is exactly what professionals demand. The overwhelmingly positive owner feedback corroborates the kit’s effectiveness in real-world settings, from quick patch cord verification to installing new cable runs.
While the initial learning curve for the Pass-Thru system and the exclusive focus on RJ45 are considerations, they are trade-offs for a kit that excels within its defined purpose. For anyone whose work or projects depend on reliable network connectivity, this kit represents a sound investment in getting the job done right the first time. It embodies the Klein Tools philosophy of creating professional-grade products that stand up to daily use. For further reading on expert-selected tools and setups, check out our Reviews page.
FAQs
What cable categories does the LAN Scout Jr. 2 tester support?
The cable tester is designed to test installed or loose data cables terminated with RJ45 connectors. It specifically supports CAT5e, CAT6, and CAT6A cable standards. It performs a wiremap and can detect various faults like opens, shorts, miswires, and split pairs on these cables.
How do the Pass-Thru connectors work?
Klein Tools’ Pass-Thru modular plugs allow the trimmed ends of the individual wire conductors to pass through the front of the connector. This lets you visually confirm all wires are correctly seated and in the proper order before crimping. The crimping tool then shears off the excess wire flush with the connector, aiming for a more reliable termination and reducing prep time.
Can the crimping tool handle connectors other than RJ45?
Yes, the included Coax Cable Crimper / Wire Stripper / Wire Cutter is a versatile tool. According to the manufacturer’s specifications, it is compatible with RJ11 and RJ12 standard connectors in addition to the RJ45 Pass-Thru connectors. It is designed for use with CAT3, CAT5e, and CAT6/6A cable types.
Is this kit suitable for a beginner learning network cabling?
While professional-grade, the kit can be suitable for a motivated beginner. The visual verification offered by Pass-Thru connectors is a helpful learning aid. However, the technique does require some practice to master. The kit provides all the core tools needed, but beginners should be prepared for a learning period and may benefit from additional practice materials not included. For foundational knowledge that complements hands-on work, our Cybersecurity resources may provide useful context.
About the author
Elvis Dicki writes reviews and buying guides for CyberSecLabs.