# LI-300 and LI-350 Help Center
- [LI-300 and LI-350 Help Center](https://www.licor.com/support/LI-300-350/home.md): Product support landing page.
## Operating Instructions
- [Operating Instructions](https://www.licor.com/support/LI-300-350/manuals.md)
- [1. Introduction](https://www.licor.com/support/LI-300-350/topics/introduction.md)
- [2. Installing the Soil Probe](https://www.licor.com/support/LI-300-350/topics/installing-the-soil-probe.md)
- [3. Configuring the LI-300 (Analog)](https://www.licor.com/support/LI-300-350/topics/configuration-analog.md)
- [4. Configuring the LI-350 (SDI-12)](https://www.licor.com/support/LI-300-350/topics/configuration-sdi12.md)
- [5. Custom Calibration](https://www.licor.com/support/LI-300-350/topics/user-calibration.md)
- [6. Maintenance and Troubleshooting](https://www.licor.com/support/LI-300-350/topics/maintenance-troubleshooting.md)
- [7. Summary of Measurement Principles](https://www.licor.com/support/LI-300-350/topics/measurement-principles.md)
- [8. Specifications](https://www.licor.com/support/LI-300-350/topics/specifications.md)