These tools provide observations, not a certification of hardware health.
An unsupported API, denied permission, absent device or restricted browser context is not evidence of broken hardware. Test results are limited to the signals exposed by the browser.
Mouse polling is an estimate of browser-delivered events, not USB polling. Pointer movement cannot identify the operating system acceleration curve. Animation-frame timing does not directly measure a physical display.
Audio levels are relative digital measurements, not calibrated sound pressure. Webcam FPS counts frames presented to the page and can differ from the configured camera rate. Gamepad mapping, stick calibration and browser filtering affect controller measurements.
Visual display tests require your observation. GPU and connectivity tools inspect availability or device selection and do not perform stress tests or certify a radio or USB connection. Use a comfortable audio volume and stop any test that causes discomfort.