# Device Tests

Device tests check whether your hardware works as expected without installing any software: you allow access when asked, then see the camera image, hear the speakers or watch each key press register. Cameras, microphones, speakers, screens, keyboards, mice, game controllers, browser details and simple performance benchmarks can all be checked this way.

## Subcategories

- [Camera, Mic & Speakers](https://techolm.com/device-tests/camera-mic-speakers) (0 tools)
- [Screen & Display](https://techolm.com/device-tests/screen-display) (0 tools)
- [Keyboard, Mouse & Controllers](https://techolm.com/device-tests/keyboard-mouse-controllers) (0 tools)
- [Browser & System Info](https://techolm.com/device-tests/browser-system-info) (0 tools)
- [Benchmarks](https://techolm.com/device-tests/benchmarks) (0 tools)

## Tools

- Microphone Test (Coming soon): Check that your microphone picks up sound by watching the input level and playing back a recording.
- Webcam Test (Coming soon): Check that your webcam works and see the resolution and frame rate it delivers.
- Dead Pixel Test (Coming soon): Fill the screen with solid colors to spot dead, stuck or hot pixels on a monitor or phone.
- Gamepad Tester (Coming soon): Check the buttons, triggers and analog sticks of a connected game controller, including stick drift.
- Keyboard Tester (Coming soon): Press keys to see which ones register, and find stuck, dead or ghosting keys.

## Frequently asked questions

### Why does a camera or microphone test ask for permission?

Browsers let a web page use a camera or microphone only after you allow it in a permission prompt. You can refuse, and you can withdraw the permission later in the browser's site settings.

### What is the difference between a dead pixel and a stuck pixel?

A dead pixel stays dark whatever the screen shows, while a stuck pixel shows one fixed color, such as red, green or blue, because some of its subpixels stay lit. Showing full-screen solid colors one after another makes both kinds easy to spot.

### What is keyboard ghosting?

Ghosting is when pressing several keys at once makes a keyboard report a key that was not pressed. Many keyboards prevent it by ignoring extra keys instead, which is called blocking. Keyboards with n-key rollover (NKRO) register every key independently, however many are held.