Monoprice Monoprice 8128 Professional Coaxial RJ 45 and RJ 11/12 Multifunction Tester w/ LCD Display P3742880 Monoprice 8128 Professional Coaxial RJ 45 and RJ 11/12 Multifunction Tester w/ LCD Display 3742880 1.59lbs 0.00 0.00 0.00
97.8000 Out of Stock


Monoprice 8128 Professional Coaxial, RJ-45, and RJ-11/12 Multifunction Tester w/ LCD Display

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Product Description

Manufacturer part number: 8128

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.

DisplaySpecial 4 x 16 character big screen LCD lattice
LCD Module70.6 x 60 mm (valid visual field is 60 x 32.6 mm) Standard
Supported Connector TypeRJ45, RJ12, RJ11 F-type Coax, BNC Coax (with included adapters)
Test Modes1-LAN, 2-TEL, 3-COAX, 4-TONE, 5-LENGTH
Supported Cable TypeShielded or unshielded, Cat6, Cat5e, Cat5, Cat4, Cat3, and Coax
Testing FunctionsOpen circuit, short circuit, jumper wire, reverse, connection or cross-talk interference, and split pairs
Measurement TypesMeasures cable length via TDR, checks and verifies wire map, generates four different tracing tones to help identify users
Cable Length & AccuracyAccuracy of the length measurement is +/- 5%, testable lengths are 1~350 meters (3~1200 feet)
Minimum Cable Length for Testing of Split Pairs1 meter (3 feet)
Power Source9 Volt alkaline battery with detection of low battery condition
Turns Off AutomaticallyAuto-off in any mode and low power consumption for long battery life
Input ProtectionProtection 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)
Humidity10 ~ 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.

NOTE: International(exclude Canada)/PO box deliveries are not available.

Product Specifications


Restricted States

This product does not ship to the APO address and the following addresses: HI, AK, PR.

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