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Handheld cable tester and PoE finder with LCD display and RJ45 ports

Monoprice Inc.

Monoprice Inc. 139386 Cable Tester PoE Finder

SKU CH-QJ55-W831Y MPN 139386

A combination cable tester and PoE finder that checks continuity, miswiring, open and short circuits, straight-through or cross pinning.

  • Number of items1
  • Product typeMultifunction Testers
  • Key featuresCable tester and Power over Ethernet (PoE) finder.
  • Tests cable continuity, miswiring, opens, shorts, straight-through and cross pinning
  • Finds PoE presence in seconds for rapid troubleshooting
  • Identifies end-span PSE types at 12-36 and mid-span at 45-78
  • Detects IEEE 802.3af and 802.3at PoE standards for compatibility checks
  • Combines cable tester and PoE finder in one compact tool

What this tool tests

The Monoprice 139386 combines a cable tester with a Power over Ethernet finder. It checks continuity, miswiring, open circuits, short circuits, straight-through pinning and cross pinning on installed or uninstalled cables. Network technicians and installers use it to verify wiring integrity and locate active PoE sources quickly.

What to verify before ordering

Ensure the cables you test use standard RJ45 terminations compatible with the tester ports. The PoE detection function identifies Power Sourcing Equipment delivering 12 to 36 volts end-span or 45 to 78 volts mid-span. It recognises IEEE 802.3af and IEEE 802.3at standards. No external power supply is required for basic continuity tests.

Build and daily use

A compact handheld housing protects the internal circuitry during field work. LED indicators give immediate pass or fault feedback for each wire map condition. The PoE finder section lights to show voltage presence and mode without needing a live network link. Lightweight construction makes it practical for ladder work or crowded patch panels.

How it compares

Measured against everything we stock in Meters, Testers & Measuring Tools, at today’s prices. Recalculated every night.

Price $20.99
Cheaper than about 76% of the 3,030 comparable items (median $54.99).

Specifications

Product
Brand nameMonoprice
Model name139386
Part number139386
Product typeMultifunction Testers
In the box
Number of items1

Questions about this item

Does the Monoprice 139386 cable tester and PoE finder come with batteries or test leads, or do I need to buy them separately?

The unit is supplied as a single item; batteries and any additional test leads are not included and must be purchased separately.

Which PoE voltage ranges does the 139386 identify, and how do they relate to end-span versus mid-span equipment?

It detects 12-36 V for end-span PSE and 45-78 V for mid-span PSE, covering both IEEE802.3af and IEEE802.3at standards.

When I connect the tester to a live link, what does the PoE indicator actually tell me about the power source?

It confirms the presence of PoE and shows whether the source is an end-span device (12-36 V) or a mid-span injector (45-78 V), letting you verify power delivery in seconds.

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