Does this correctly test cat-6 cables?

I don't think that statement is entirely true, I have cables that I know are bad and do not work, but this tester says they are good. But they still don't work.

Has anyone used this tester to check USB 2.0 cables?

This is to test the USB 2.0 cable

I need to test my Ethernet Wall jack to figure out why there's no connection. Can this identify the issue?

It's designed to test cables and their connectors not the actual jack. You can use it as if you are testing a cable by plugging the source into one port of the tester and use a cable (which is a double male end) to plug into the jack and other port on the tester. Make sure that the source is getting the signal/connection before pointing the finger at the jack. Also, make sure your device (laptop, etc) is working by plugging directly into the source. If all those pass then make sure the pins in the jack aren't pushed in, which is usually caused by a damaged connector (plastic end). Make sure your cable has the groves in the connector completely cleared and straight and not smashed down.

Does both the main unit and the remote test coaxial? I don't see coax on the remote.

Test USB RJ11 RJ45 and BNC, you can see in the product description, there are detailed instructions in the product brochures.

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4 in 1 Network Cable Tester Multi Functional for RJ11 RJ45 USB BNC LAN Cable Wire Tester

4 in 1 Network Cable Tester Multi Functional for RJ11 RJ45 USB BNC LAN Cable Wire Tester

Product ID: 11326973

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Details

Brand
Optimal Shop
Power Source
Battery
Color
Gold
Item dimensions L x W x H
8.7 x 4.4 x
Min. Operating Voltage
9 Volts

⚡One-click quick test

📏300 ft remote test range

🔌4-in-1 multi-connector testing

Description

🔧 Master your network with precision — don’t let faulty cables slow your hustle!

ERGONOMIC PORTABLE DESIGN - Compact handheld tester fits perfectly in your toolkit for on-the-go professionals.
INSTANT ONE CLICK DIAGNOSTICS - Get clear LED indicators for wire faults, shorts, and cross connections in seconds.
EXTENDED 300 FT REMOTE TESTING - Diagnose cable issues from afar with a powerful remote module for real-world convenience.
GOLD PLATED PRECISION CONTACTS - Reliable 50u gold plating ensures accurate readings and long-lasting durability.
UNIVERSAL CONNECTOR COMPATIBILITY - Test RJ11, RJ45, USB, and BNC cables effortlessly with one sleek device.

The Optimal Shop 4-in-1 Network Cable Tester is a portable, battery-powered device designed for professional-grade testing of RJ11, RJ45, USB, and BNC cables. Featuring a 300-foot remote test range, one-click operation, and LED fault indicators, it ensures quick and accurate diagnostics. Its ergonomic design and gold-plated contacts make it an essential tool for network managers and IT pros aiming for flawless connectivity.

Specifications

Brand	Optimal Shop
Power Source	Battery Powered
Color	Gold
Item dimensions L x W x H	8.7 x 4.4 x 1.8 inches
Min. Operating Voltage	9 Volts
UPC	799637908536
Manufacturer	Optimal Shop
Series	FBA_Optimal Shop
Item model number	Optimal Shop
Item Weight	7.8 ounces
Product Dimensions	8.7 x 4.4 x 1.8 inches
Item Dimensions LxWxH	8.7 x 4.4 x 1.8 inches
ASIN	B00NDWBGHS
Is Discontinued By Manufacturer	No
Date First Available	September 7, 2014

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