The LI-600

The LI-600 Porometer/Fluorometer is a lightweight handheld instrument that takes combined stomatal conductance, and Pulse Amplitude Modulation (PAM) chlorophyll a fluorescence measurements of a leaf in seconds. It delivers precise, high-throughput stress evaluations over the same leaf area and can quickly survey plants under ambient conditions.

The LI-600 has a GPS receiver that records the latitude, longitude, and altitude for each measurement, allowing users to track, return to, and map locations. The LI-600 includes a magnetometer/accelerometer that measures the pitch, roll and heading of a leaf. These measurements, along with information from the GPS receiver, enable the LI-600 software to calculate the angle of incidence of a leaf for each measurement.1

The LI-600 computer software is available for both Windows® and macOS®. It is used to create and upload configurations to the instrument, download data from the instrument, record live data, and create barcodes. The software is available for download at:


The LI-600 components are as shown below.

Figure 1‑1. LI-600 Components.
  1. Aperture. (0.75 cm diameter) Surrounds the leaf gasket, is the active measurement.
  2. Aperture clamp. Closes onto the leaf.
  3. Fluorometer (optional). Takes PAM chlorophyll a fluorescence measurements.
  4. Quantum sensor. Measures ambient light level.
  5. Accelerometer / Magnetometer (internal). Measures pitch, roll, and heading.
  6. Display. Shows measurement workflow, instrument settings, and variables data.
  7. Navigation arrows. Moves up, down, right, and left through options and screens.
  8. Enter button. Powers on the instrument and selects options.
  9. Handle. Encloses the rechargeable battery.
  10. Micro-USB port. Connects the instrument to the computer or universal charging adapter via micro-USB cable.
  11. Barcode scanner. Scans barcodes.
  12. Tripod mount. (1/4-20 UNC) Attaches to a tripod.
  13. Porometer. Takes stomatal conductance measurements.

Parts and accessories kit

The LI-600 comes with a kit that includes the following accessories and replacement parts. Additional parts and accessories can be purchased separately (see Support).

Table 1‑1. LI-600 Parts and Accessories Kit
Description Quantity Part Number
Aperture clamp 2 6360-350
Face seal O-rings 2 192-17935
Filters 2 301-19838
Foam swabs 6 610-16093
Leaf gasket 2 6360-356
Microfiber cloth 1 229-16069
Radial seal O-rings 4 192-18368
Scrub tube zero kit 1 9968-258
Spare screws 20 150-14386
Charging adapter 1 591-19074
Charger prong kit 1 591-19075
USB cable 1 392-19077
Wrist strap 1 610-19076
Zero adapter assembly 1 9960-327

600-01F Fluorometer upgrade kit (optional)

The 600-01F Fluorometer Upgrade Kit adds the fluorometer module to the porometer model.

The LI-600 porometer-only includes a fluorometer blank. If the instrument is upgraded and the fluorometer needs to be removed, reinsert the fluorometer blank. The gray ribbon cable does not attach to the fluorometer blank. Store the fluorometer in the carrying case with the instrument.


The user manual, instructional videos, technical documents, webinars, FAQs, and other resources are available online at The user manual can be downloaded as a PDF.

To contact LI-COR environmental support, go to .