Service Discontinuation Notice

Due to parts obsolescence, factory repair of the LI-6400/XT has ended as of December 31, 2025. All LI-6400/XT instruments are eligible for a trade-in discount when upgrading to the LI-6800. Contact us to learn about upgrade discounts.

Operating Instructions

Operating information and PDF instruction manuals.

Software Downloads

Software and firmware for the product.

Video Library

Watch videos for tips and tricks from the LI-COR technical support team.

All Documents

More technical notes, application notes, installation guides, and other documents.

Frequently Asked Questions

Answers to common questions.

Troubleshooting

Solutions that will keep you collecting the best data.

Factory Service and Recalibration

Factory calibration is an integral step in the manufacture and repair of all LI-COR measuring instruments.

About LI-6400/XT Factory Recalibration

To request factory service or recalibration for a LI-COR instrument, request factory service or contact your local distributor. Service will be performed at our US office in Lincoln, NE USA, European office (LI-COR GmbH), or by your local distributor.