Building PCHardwareTest — what PC hardware test should I add next?

I built PCHardwareTest as a browser-based toolkit for checking common PC hardware without installing software.

It currently includes keyboard, mouse, webcam, microphone, speakers, screen, gamepad, touchscreen, battery, network and browser-reported system information tests.

I’m preparing for the Product Hunt launch and would love to hear what hardware test or troubleshooting feature people think would be most useful to add next.

https://pchardwaretest.com/