Professional Coaxial, RJ-45, and RJ-11/12 Multifunction Tester w/ LCD Display
    Product # 8128
    Professional Coaxial, RJ-45, and RJ-11/12 Multifunction Tester w/ LCD Display
    Product # 8128
    In Stock This item should ship tomorrow (2/8/2016) if ordered within 6 hours 47 minutes

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    Professional Coaxial, RJ-45, and RJ-11/12 Multifunction Tester w/ LCD Display

    The Monoprice LAN Cable Solution is one of the easiest to use and most complete multifunction cable testers available.

    This unit can test the integrity of RJ45, RJ11/12, F-type Coax, and BNC Coax cables for shorts, open conductors, crossed wires, and cable length. The 16 x 4 character LCD display shows either Pass or Fail on any cable test, and if Failed, the specific wires that failed and the type of failure.

    The Loopback testing mode can test any RJ type cable (11/12/45) with each end connected directly to the tester. This can test for Open, Short, Crossed, or Split conditions for each conductor. It also identifies whether the RJ cable is shielded or unshielded. Additionally, it can show the distance along the cable at which an Open occurs using the built-in Time Delay Reflectometer (TDR), allowing you to easily locate the point of failure. Cable length can be tested out to 350 meters.

    When testing Coax type cables and RJ45 with the ends at different locations, the included Remote Terminator is used to test for Open, Short, or Crossed connections. When an Open condition is detected, the distance to the break point is displayed. The Remote Terminator is stored in the base of the unit and can be easily removed for testing.

    Both the Length and Tone modes are tested without a terminator or direct connection to the other end of the cable. The length mode shows the total length of the cable, or the length to any existing cable break. In Tone mode the tester sends a tone down the cable, which can be sensed using an Amplifier Probe (not included). This can be used identify cables within a bundle or as an alternate method of locating cable breaks.

    A built-in memory module allows you to store 8 results each for LAN and TEL modes, plus 4 results each for Coax and Length modes. The tester has an automatic power-off feature to save battery life, which kicks in after 5 minutes of nonuse in all modes except TONE mode, and after 30 minutes in TONE mode.


    WARNING!!! Do not test live circuits as it could cause damage to the tester unit or personal injury.

    Support Files:

    Display Special 4 x 16 character big screen LCD lattice
    LCD Module 70.6 x 60 mm (valid visual field is 60 x 32.6 mm) Standard
    Supported Connector Type RJ45, RJ12, RJ11 F-type Coax, BNC Coax (with included adapters)
    Test Modes 1-LAN, 2-TEL, 3-COAX, 4-TONE, 5-LENGTH
    Supported Cable Type Shielded or unshielded, Cat6, Cat5e, Cat5, Cat4, Cat3, and Coax
    Testing Functions Open circuit, short circuit, jumper wire, reverse, connection or cross-talk interference, and split pairs
    Measurement Types Measures cable length via TDR, checks and verifies wire map, generates four different tracing tones to help identify users
    Cable Length & Accuracy Accuracy of the length measurement is +/- 5%, testable lengths are 1~350 meters (3~1200 feet)
    Minimum Cable Length for Testing of Split Pairs 1 meter (3 feet)
    Power Source 9 Volt alkaline battery with detection of low battery condition
    Turns Off Automatically Auto-off in any mode and low power consumption for long battery life
    Input Protection Protection against excess voltage, transients ringer signal
    Dimensions (WHD) 3.5" x 1.6" x 7.7" (90 x 40 x 195 mm)
    Operating Temperature +32 ~ +122°F (0 ~ +50°C)
    Storage Temperature +14 ~ +140°F (-10 ~ +60°C)
    Humidity 10 ~ 90%, non-condensing

    Package Contents:

    • 1x Tester unit
    • 1x Remote terminator (attached to tester base)
    • 1x Zippered, nylon carrying case with front pouch
    • 2x F-type male to BNC type female coax adapters
    • 2x RJ45 to RJ11 adapter clips
    • 1x 9 volt alkaline battery

    Note: Please remove plastic wrap from battery before use.

    36 Reviews

    66.39% of the reviewers recommend this product


    Amazingly useful!

    • DH405,
    •  Oklahoma City, OK 
    • 11/2/2015 12:55:20 PM

    Pros: Reliable
    Useful data
    Works for F and, with an adapter, BNC connections as well!
    Looks impressive

    I've had this tester for a little more than a year and I use it on at least a weekly basis, with some BIG jobs throughout the year involving heavy use. It's always done its job, and I've been really happy with the unit.

    Was this review helpful to you?

    Warning! Defective product

    • Anonymous,
    •  sacramento, ca 
    • 4/19/2015 3:20:19 PM

    Pros: It was a great device while it worked.

    Cons: It stopped working after less than a dozen uses.

    I purchased this tester 12/26/12 and have used it less than 10 times. It sits in my closet with the rest of my tech stuff. Every 6 months or so I have used it to test a new network cable I made or to tone a line for a friend. Well today, it doesn't turn on. $90 down the drain. Talked with support and was told that I was out of luck. DO NOT BUY THIS PRODUCT! I have never had a device fail after so little use and for no reason. I had always heard such good things about Monoprice's Customer Support. Very disappointing customer service and very disappointing product.

    Was this review helpful to you?

    Wont last

    • Mike,
    •  Rockwall, TX 
    • 1/24/2015 5:42:37 PM

    Pros: Worked great while it worked. Easy to use and read

    Cons: This is my second unit. Both crashed after about a year. tester reads cross pair on 5 no matter what cable I use. I bought the same unit twice and same thing happened both times. I would like to get a replacement tailpiece as the loop function seems to work fine. I think the problem is with the detachable remote portion (although I'm not really sure) I was overly careful with this unit and it's in practically "new condition" but sitting in a case on my desk now.

    by Monoprice Administrator
    Hi Mike,

    Thank you for your review and truly sorry to hear about your experience with PID 8128. I will pass this on to our Product development team so that they may look into resolving these issues or making the product better. For future reference, we do have support via live chat if you ever have questions regarding our products or troubleshooting. Regarding the issue, would you happen to have your order number for the item? Please let me know. Thank you!

    Gisselle B.
    Tech Support

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    Good tester - Wish it was POE compatible

    • Brian ,
    •  Bothell, WA 
    • 10/1/2014 10:18:13 AM

    Pros: Good price. The TDR to determine length has come in handy in unexpected ways. As cable tester, functions acceptably.

    Cons: Not POE compatible
    Must reset length from Meters to Feet every time unit is turned on. Remembering the setting would be nice.

    I accidentally connected the tester to a Cat5 cable that had phantom power @ 48V on the conductors. The tester now reports all cables as shorted. It would be nice if the tester had protection for Power Over Ethernet, and displayed an error such as "Cannot test cable, voltage is present"
    The cable tester is now a paperweight.
    The manual didn't warn of POE. I know testing for opens and shorts can't be done (easily) in a powered-up state, so My Bad.... But just saying..... Be careful!

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    Good, but defective display.

    • Anonymous,
    •  Lawton, OK 
    • 9/28/2014 2:41:32 PM

    Pros: Built well physically, backlight display

    The backlight has to be turned on through the settings menu each time the device is turned on. The display died on me two and a half weeks after buying the device.

    by Monoprice Administrator

    Thank you for your review and my apologies for the issues you have experienced with PID 8128. Unfortunately, it sounds like you may have received a defective product. Now if you’d like, I can help setup an RMA for a replacement. If you would like me to proceed with the RMA, just let me know and I can get this started right away. Sorry again for the trouble and hope this helps!

    Jonathan Arteaga
    Tech Support Associate

    by Anonymous

    Thank you for the reply. I have already initiated an RMA.

    Thank you.
    Was this review helpful to you?
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