Why you can trust ZDNet
Our recommendations are based on many hours of testing, research, and comparison shopping. We may earn a commission when you purchase a product through our links. This helps support our work but does not influence what we write about or the price you pay. Our editors thoroughly review and fact check every article. Our process

‘ZDNet Recommends’ What exactly does that mean?

ZDNet’s recommendations are based on many hours of testing, research, and comparison shopping. We gather data from the best available sources, including vendor and retailer listings as well as other relevant and independent reviews sites. And we pore over customer reviews to find out what matters to real people who already own and use the products and services we’re assessing.

When you click through from our site to a retailer and buy a product or service, we may earn affiliate commissions. This helps support our work, but does not affect what we cover or how, and it does not affect the price you pay. Neither ZDNet nor the author are compensated for these independent reviews. Indeed, we follow strict guidelines that ensure our editorial content is never influenced by advertisers.

ZDNet's editorial team writes on behalf of YOU, our reader. Our goal is to deliver the most accurate information and the most knowledgeable advice possible in order to help you make smarter buying decisions on tech gear and a wide array of products and services. Our editors thoroughly review and fact-check every article to ensure that our content meets the highest standards. If we have made an error or published misleading information, we will correct or clarify the article. If you see inaccuracies in our content, please report the mistake via this form

Close

This USB simple tester will save you lots of diagnostic headaches

The perfect USB tester for home users and professionals on the move.

One of the tools I get asked about a lot is USB testers. USB charging is ubiquitous these days, and this simple, low-cost tool allows you to test the output of chargers and power banks, and also a way to check the rated capacity of a device, or the condition of the battery.

For $20, here's a great USB tester for doing such thing.

Check this out: Extreme weather forecast? Essential gear for when the power goes out

2-in-1 USB Tester

2021-02-12-19-49-30.jpg
  • USB-A and USB-C support
  • Multi-color display
  • Supports QC3.0, QC2.0 and BC1.2
  • Over-voltage protection
  • Measures Voltage, Amperage, temperature, mAh, resistance, and more
  • Easy to use (although the instructions c

What's the best way to learn to use this?

Use it!

Plug it into things and see what results you are getting. Testing if ports are functional and if power is flowing is simple -- plug it in and watch the power flowing.

You can also do tests such as seeing the capacity of rechargeable batteries by discharging them fully and recharging them through this (reset the mAh reading to zero first).

The more you play, the more you'll learn.

Another item I recommend adding to your kit is a USB load. There are a lot out there, with fans and such, but I find myself turning to the old-school loads that feature a couple of giant resistors and a switch that changes the load from 1A to 2A.

Note that these loads do get hot, so I recommend using them on a fire-proof surface. Otherwise, you might be better with a fan-cooled load (which also get hot, only less so).

Show Comments