Webcam, speaker and dead-pixel checks before a meeting

Five-minute pre-call checklist

1. Microphone — levels move when you speak.
2. Webcam — focus and lighting look acceptable.
3. Speakers — left/right output works with your headset.
4. Screen — quick pass if you present slides.
5. Close bandwidth-heavy tabs before joining.

All tests run in the browser from the device test hub.