# LI-192 & LI-193 Help Center
- [LI-192 & LI-193 Help Center](home.md): Product support landing page.
## Instruction Manual
- [Instruction Manual](manuals.md)
- [1. General Information](topics/192-193-general-information.md)
- [2. Factory Recalibration Procedure](topics/192-193-calibration-procedures.md)
- [3. Using the Sensors](topics/192-193-using.md)
- [4. Cleaning and Maintenance](topics/192-193-maintenance.md)
- [5. Accessories](topics/192-193-accessories.md)
- [6. Bibliography](topics/bibliography.md)
- [A. Specifications](topics/192-193-specifications.md)
## Videos
- [Videos](Light-Sensors/videos.md)
- [Using Light Sensors with the LI-1500](LI-1500/videos/connect-to-li-1500.md)
- [Connecting Underwater Light Sensor Cables](videos/connect-underwater-cables.md)
## Documents
- [Documents](docs.md)
- [Measuring PPFD with Underwater Light Sensors](topics/ttp033-ppfd.md)
- [Connecting Underwater Light Sensor Cables](topics/md109-underwater-cables.md)
- [Getting Correct Readings](topics/faq003.md)
- [Dimensions](topics/ttp050-dimensions.md)
- [How to Prevent Negative Readings](Light-Sensors/topics/negative-readings.md)
- [Amplifying the Output Signal of Radiation Sensors](Light-Sensors/topics/ttp003-amplifier.md)
- [Light Sensor Amplifier 2420](Light-Sensors/topics/2420-quick-start.md)
- [Converting Light Sensor Output to Voltage](Light-Sensors/topics/ttp004-voltage-reader.md)
- [Wireless Light Sensor Network with Particle Argon](Light-Sensors/topics/wireless-light-sensors-particle-argon-platform.md)
- [Wireless Light Sensor Network with NI](Light-Sensors/topics/wireless-sensor-networks-national-instruments.md)
## FAQs
- [FAQs](faqs.md)
## Factory Calibration
- [Factory Calibration](factory-calibration.md)