> For the complete documentation index, see [llms.txt](https://emotiv.gitbook.io/flex-2.0-user-manual/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://emotiv.gitbook.io/flex-2.0-user-manual/achieving-high-eeg-signal-quality.md).

# Achieving High EEG Signal Quality

- [Gel Sensors](https://emotiv.gitbook.io/flex-2.0-user-manual/achieving-high-eeg-signal-quality/gel-sensors.md)
- [Saline Sensors](https://emotiv.gitbook.io/flex-2.0-user-manual/achieving-high-eeg-signal-quality/saline-sensors.md)