RJ-11 and RJ-45 Modular Plug Tester
    Product # 8138
    RJ-11 and RJ-45 Modular Plug Tester
    Product # 8138
    $7.43
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    In Stock This item should ship today (5/4/2016) if ordered within 3 hours 36 minutes

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    RJ-11 and RJ-45 Modular Plug Tester

    This Monoprice RJ11/RJ45 tester is a simple, yet powerful, tool that helps troubleshoot network and telephone cables for broken wires and crossed connections.

    The tester consists of a main Master unit and a detachable Remote unit, each of which have an RJ11 and an RJ45 jack. The unit is powered with a 9-volt battery (not included) and can be stored in the included, zippered, synthetic leather case.

    The Master and Remote unit each have a series of 9 LEDs that show the status of each line on the attached cable. The tester supports both a fast automatic and a slow automatic mode.

    The following operating instructions supercede the instructions contained in the enclosed operator's manual.

    To test a cable:

    1. Insert one end in the appropriate jack on the Master unit and the other in the same type jack on the Remote unit.

      IMPORTANT! DO NOT CONNECT TO A CABLE THAT IS PLUGGED IN TO A LIVE CIRCUIT AS THIS MAY CAUSE DAMAGE TO THE TESTER OR OTHER EQUIPMENT ON THE CIRCUIT!

    2. Move the tester power switch to the "On" or "S" position. For best results, use the Slow Automatic mode (S position) to perform the test, as this gives time to watch the light sequence and ensure that the same LEDs illuminate on the Master and Remote simultaneously.

    3. Watch the LEDS on both the Master and Remote units. Under normal conditions, using a straight-through RJ45 cable in good condition, the LEDs will simultaneously illuminate in the sequence 1-2-3-4-5-6-7-8-G on both the Master and Remote units.

    4. A faulty or miswired connection will produce a different result, as follows:

      1. If there a wire is broken or otherwise not connected the LED on the Master unit will illuminate, but no LED will illuminate on the Remote unit.

      2. If a wire is crossed, different LEDs will illuminate on the Master and Remote units. For example, if the 3rd LED on the Master unit and the 5th LED on the Remote unit both illuminate then the wire is crossed between pin 3 on the Master side and pin 5 on the Remote side.

      3. If there is a short circuit between two or more wires, no LEDs will illuminate on either the Master or Remote unit.

    Note that when testing RJ11 or RJ12 cables with a 6P6C connection, only the LEDs 1-6 will illuminate. If using a 4P4C connection, only the LEDs 2-5 will illuminate.



    This product requires a 9 volt battery, which is not included!



    Support Files:

    Package Contents:

    • 1x Cable Tester Master unit
    • 1x Cable Tester Remote unit (attached to Master)
    • 1x Synthetic leather, zippered carrying case

    93 Reviews

    92.26% of the reviewers recommend this product

    ADD YOUR REVIEW

    Peace of mind for a nominal price

    • JRNorman,
    •  Sugar Land, TX 
    • 4/10/2016 4:21:17 PM

    Pros: Quick and each way to test any Ethernet cable. Best of all it comes in two parts so you can test cables installed in the walls.

    Cons: None that I know of. The construction is a little flimsy but for the hobbyist it should be dependable. Might not last too long for a professional who uses it lot.

    It helped me determine whether the problem I was having was in the Ethernet receiver, the wiring or the router. I would still be scratching my head without it.

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    Good value

    • DVACPA,
    •  Plainview, NY 
    • 3/31/2016 11:34:56 AM

    Pros: Small size and case.

    Cons: Light display difficult to read.

    Tester is good for the price.. Lights are a bit difficult to follow.. The light below the indicator light that is one, appears to be on as well. I like the small size and case.

    Was this review helpful to you?

    Great inexpensive basic cable tester

    • K,
    •  Buena Vista, CO 
    • 3/30/2016 9:39:39 AM

    Pros: Inexpensive
    Small
    Lightweight
    Simple/Easy to Use

    This tester does a basic continuity check on each individual wire in a cable. This will show you if you have any breaks, shorts, or mismatches between ends - all you need for basic wiring projects, especially around the house. I really like that this has RJ-11 and RJ-45 ports built in, no need for separate adapters. You may want to purchase a couple of short cables of either/both types to go with this tester, for use with jacks/female ends. The only small drawback (not even going to list it as a "Con") is that the zippered case - otherwise of fine quality - has no room for anything else (cables, spare battery).

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    Good tester for the price

    • Winter Lane,
    •  ,  
    • 3/6/2016 2:58:53 PM

    A very cheap tool. It doesn't tell me much about the circuit, but it is enough to confirm no crossed wires, shorts, opens, etc. All circuits operating as designed once installed, so it must be accurate enough.

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    Could Have Used This Years Ago

    • Miker,
    •  Westlake Village, CA 
    • 2/29/2016 6:03:02 PM

    Pros: Inexpensive, easy to use, finds your mistakes before installation

    Cons: Doesn't come with any instructions.

    I didn't think I needed this until I tried it. I mean how hard is it to match both ends of a wire? First wire I made I tried it and got conflicting results between the Master and Remote. Sure enough I wired one end of the cable backwards because I was holding the plug upside down when I made it. Bottom line, if this saves having to debug even one cable or jack after installation it is well worth it.

    Was this review helpful to you?
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