> ## Content Index > Fetch the complete content index at: https://aftermath.site/llms.txt > Use this file to discover other available public pages before exploring further. # I Love My Slightly Overkill USB-C Cable Tester - URL: https://aftermath.site/alientek-c2-pro-usb-cable-tester/ - Published: 2026-10-16T19:11:30.000Z - Updated: 2026-10-16T19:11:30.000Z - Description: I have way too many USB-C cables, and I need a way to test them. The Alientek C2 Pro is a solid tool for people that have high standards for USB. - Author: Chris Person - Tags: Hardware, Hardware Reviews Gonna be blunt here: I got too many USB cables. And a lot of those USB cables happen to be bullshit, unable to properly transfer a decent amount of power or data. The process of finding out which cables are and aren’t bullshit without solid tools to test them is usually one of trial and error to the point where it is more a folk science. For a long time I have wanted to take the plunge on a USB-C tester, and now I have one. Though it is very confusing and difficult to parse, I’m glad I have it. You probably do not need one, but I do, and I love mine. ![](https://storage.ghost.io/c/30/f5/30f5b1bb-84ee-4c26-b446-fb9a5e512994/content/images/2026/10/61TMq46q3bL._SL1200_.jpg) The KM003C is the standard, but I returned mine for the Alientek C2 Pro because I wanted to test cable resistance. The gold standard for this tech for a long time was the ChargerLAB Power-Z KM003C. [ChargerLAB](https://www.chargerlab.com/?ref=aftermath.site) is a website I frequent whenever I need testing results for a specific battery charger. They are the English language version of the site [Chongdiantou](https://www.chongdiantou.com/?ref=aftermath.site), which also does similar testing. The Power-Z is very solid for what it is, but recently there has been competition from other companies, including a company called Alientek. Alientek is one of those AliExpress brands like Mechanic that I have found punches above its weight in terms of quality for an affordable price. My previous experience with Alientek was buying their soldering iron, the Alientek TP80P, as a replacement to my previous soldering iron, the Pinecil V2\. The TP80P uses JBC C245 style tips, which are far more efficient at transferring heat than the ones the Pinecil uses. I have the T80B and it's mostly pretty solid! Anyway here's a video to get you into Chinese-language hardware YouTube. Alientek took a shot at the Power-Z with its own model, the C2 Pro (along with the lower spec’d C2 and C2 lite), which has a similar form factor: a small square dongle with a screen and four buttons in a case made out of machined aluminum. It has more features for roughly half the price, and I had to order mine from AliExpress. In addition to having rough feature parity, Alientek also introduced an add-on board called the OA1 that is used to measure cable resistance values from any USB-C to USB-C/A cable you might have, a feature that ChargerLAB’s own tester seems to lack. Alientek also has a cheaper model called the C0, which I have not tested. The C2 covers all major protocols up to USB-C PD 3.2. One of the best comparisons I've seen between the Power-Z KM003C and the Alientek C2 Pro is this Japanese review. I agree with him on both the value of the device as well as the KM003C’s overall polish being better out of the box. The Alientek C2 Pro comes in a small tin case with a cutout for the optional board and a screen protector. The manual to use it is disorienting and slightly hard to discover, but the features are well enough labeled to be parsable. Plugging the device in between a device like a phone or power bank and a power source like a power bank or charger will give you a basic accounting of the voltage, amperage and watts, as well as which power delivery standard the cable and charger are using. The C2 has a mode that lets you test the available standards for any cable, and the device is able to read emarkers, the tiny chip in USB-C cables that communicates the overall capability of the device. ![](https://storage.ghost.io/c/30/f5/30f5b1bb-84ee-4c26-b446-fb9a5e512994/content/images/2026/10/A005_08070447_S006.jpg) You don't need this to read E-markers but it can do that! If you don’t have the C2 or C2 Pro but already have a Mac, you can get halfway there with an app called WhatCable, a free app with a paid upgrade that my colleague and Aftermath Hours guest [Sean Hollister from The Verge](https://www.theverge.com/gadgets/963759/whatcable-usb-c-cable-tester-app-mac?ref=aftermath.site) recommends. For most people that will be enough, although many of its results are dependent on the cable in question having an emarker to begin with. ![](https://storage.ghost.io/c/30/f5/30f5b1bb-84ee-4c26-b446-fb9a5e512994/content/images/2026/10/whatcable.jpg) WhatCable is a really solid app. The Alientek C2 is not the most straightforward device and, like many gadgets you buy off of AliExpress, support is relegated to a weird subsection of a public facing website and involves downloading a .rar file. There’s an app with cross-platform support for realtime monitoring, although as with most of these things your mileage may vary as to if you trust a weird app downloaded from a random site There is also an iOS and Android version of the app, [although the video instructions](https://www.youtube.com/shorts/qEem8jWmT0I?ref=aftermath.site) for what the app is called on the iOS store appear to be contradictory and feature the phrase “by default, \[the app\] starts in Chinese.” I would be more critical of Alientek here, but this is clearly a device intended for a domestic market with other concerns being secondary. ![](https://storage.ghost.io/c/30/f5/30f5b1bb-84ee-4c26-b446-fb9a5e512994/content/images/2026/10/app1.jpg) The Desktop app is pretty solid if you want comprehensive readings. There’s tons of useful features outside of even the OA1 resistance measurement, including the ability to record and estimate the actual capacity on power banks. Given how much bullshit there is surrounding the advertised capacity of power banks, that’s an incredibly useful feature for a reviewer or someone who deals with a lot of random USB-C cables. The app and device also let you monitor ripple, assessing how good the basic quality of the power being delivered from the device actually is in practice. ![](https://storage.ghost.io/c/30/f5/30f5b1bb-84ee-4c26-b446-fb9a5e512994/content/images/2026/10/A005_08070412_S022.jpg) Seeing if my [suspiciously fast charging power bank](https://aftermath.site/i-love-my-suspiciously-fast-charging-power-bank/) is accurate. But ultimately the real question is: How useful is the Alientek C2 Pro to the average reader? I can’t presume to know the life of the average Aftermath reader, but my guess is that the majority of people out there do not really need a device like this. My guess is that you do not push your USB-C cables that far, and knowing the exact power delivery standard of every cable in your house is not particularly useful above a certain range. But for the people out there who are either aggressively rigorous about their gear, or cannot abide bad USB-C cables for professional reasons, the Alientek C2 Pro and its cohorts are invaluable, if not slightly confusing, tools to own at an affordable price. ![](https://storage.ghost.io/c/30/f5/30f5b1bb-84ee-4c26-b446-fb9a5e512994/content/images/2026/10/A005_08070416_S040.jpg) It has a little tin and cutouts for both the charger and the add-on board.