Handheld Laser Leaf Area Meter


Product Details


  • The CI-203 should have the timing parameters re-computed when any changes are made to the Setup Menu, or if the instrument does not measure correctly. To re-compute the timing parameters, press the Left and Right arrow key at the same time from the Measure menu. The motor should spin up for about 4 seconds and then shut off.

  • There are two small black caps on either side of the conveyor drum. These caps can be removed, allowing a cloth to be passed through the conveyor drum. Any loose debris or particles can be vacuumed out or otherwise removed. The drum can be wiped with a clean cloth to remove any smudges.

  • There are two commonly used ways to transfer data from a CI-203 with an SDcard. The first is to connect the CI-203 to a computer using the USB cable. Typically, the computer's "Autoplay" will pop-up with a message asking what to do with the "Removable Device." Choose "Open folder to view files." Open and re-save the files off the SDcard before making any changes. The second transfer involves simply taking the SD card out of CI-203 and inserting in a computer's SDcard reader. Transfer and re-save the files off the SDcard before making any changes/edits.
  • Neither of these methods of transferring the data from the CI-203 require that the CI-203 driver be installed on a computer. The data transfer is designed to be quick and easy with the SDcard, involving NO software or drivers. ALWAYS SAVE THE FILE ON THE COMPUTER BEFORE MAKING ANY CHANGES. DO NOT EDIT FILES ON THE SDCARD.

  • If your CI-203 or CI-203CA is not measuring length accurately, you may be losing the length value for either or both of the following reasons:
         a) You may not be pulling the longest portion of the leaf exactly perpendicular to the roller.
         b) You have missed the very start of the leaf. Only the longest petioles allow for complete leaf measurements.
  • These factors should be considered by the researcher and necessary adjustments made. The area measurement is typically more significant and more accurate than the length measurement, because it is based on two different vectors and sensing mechanisms. Area, however, is still subject to the 2 potential sources of error listed above, though to a lesser extent.
  • If you think your instrument is not measuring length accurately, a photo of the leaf or a video of the measurement would help determine whether the technique or the instrument is introducing the error. Please email for help.

  • The last three columns in the data sheet (Rec_Off, Rec_Len and Pix_Len) hold image rendering information. This information does not affect the leaf measurement, but if the user changes any data in these columns and saves it to the SDcard, it can corrupt the data file. Rec_Off is for image offset information and Rec_Length has length of image information.

  • The CI-203 does not take a picture of the leaf. The unit works using a laser light. The leaf image that is displayed on the instrument after taking a measurement is only the outline of the leaf and the entire leaf is gray. You can see larger holes in the leaf through the “voids” feature, which records the number of holes and will show these holes in the post-measurement leaf image on the display.

  • There are two files transferred for each data file. One holds the spreadsheet and length/area/width information. The other file is an image file which holds the image of the scanned leaf-what the user can see on the CI-203 display after a measurement is made. We are working on a software that allows the user to see this image after the initial measurement. For now, the .img file holds the information that the data file shows in numbers. Also, if there is no data in a file, the file name will still appear on the SDcard.

  • The CI-203 can be affected by rapid changes in humidity and temperature, such as when moving from an air conditioned vehicle to a hot field habitat or greenhouse. With the rapid shift in the environment, there is a small chance condensation may form causing a temporary freeze-up of the CI-203. To remedy this, it is advised to wrap the instrument in a plastic bag and allow it to equilibrate with the ambient temperature when changing the instrument's environment. If the environmental change is small the user should not need to allow the unit to stabilize as long and should not incur a unit freeze-up.

  • Use a soft, clean lint-free cloth to wipe down the scan glass under the arm. Make sure the scan glass is free from particles and debris. You can use canned air to remove any debris on or under the glass by gently passing the air across the scan window.

  • The CI-203 requires that you create at least 2 files before taking a measurement. To create a file, go to the File<Create menu and use the up/down arrows to set the file name to what you desire. Then, save the file name. If the unit does not have a file created, it will not be able to save measurement data and may not work properly.

  • Connect the instrument to the computer with the USB cable. This should cause the freeze-up to go away and you will be able to restart the instrument.

Switched column headers was a bug that was fixed in firmware version 4.20. In previous firmware versions, the headers for the data columns "factor" and "ratio" are reversed on the SD card.  Please be aware of this bug that will be fixed in a future firmware version.  The correct order of the data headers is:  

Date, Time, Area, Length, Width, Perim, Ratio, Factor, Void, Lat, Lon, Alt, Rec_Off, Rec_Len, Pix_Len

  1. Install FlashAir™ Wi-Fi card software appropriate to the SD card (W-03). 

    • Visit to download the software for configuring the Wi-Fi card and obtain vendor operation instructions.

  2. Insert the Wi-Fi card onto a personal computer (PC).
  3. Open the “FlashAirTool” on your PC to configure the SD card.
  4. Follow the configuration instructions prompted by the “FlashAirTool”. It is recommended to map the Wi-Fi card as a drive as prompted by the FlashAirTool. This creates a shortcut on your desktop to easily access your files from your device.
  5. For additional guidelines, access the “Help” menu inside the “FlashAirTool” software.

For more information on the Toshiba FlashAir™ W-03 Wireless SD Memory Card, contact the application vendor at

  1. Open up the desired manual in a browser window 
  2. Click ‘Accessibility Mode’ 
  3. Select the download icon. The manual will download as a pdf. 

  • Run a Google search for LIBUSB windows (your operating system) Example: “LIBUSB Windows XP”
    • Select the link for “”
    • It may say libusb-win32
    • Scroll down the page or find the link to the download site
    • Download
    • Save the file and remember where
    • Open the zip file after downloaded
    • Open libusb-win32-bin. folder
    • Open “bin” folder
    • Double click the inf-wizard.exe
  • Plug in the device and turn it on
    • Now you are in the Inf-wizard
    • Click next when the CI-203 is plugged in and on
    • Find the device in the list of USB devices: it will most likely be named a set of numbers, such as 0425:0500: if you can’t determine which device is the CI-203, unplug it from the computer and see which one disappears.
    • Select the device and click next
    • Rename the device to CI-203
  • Save CI-203.inf and remember where
    • Click INSTALL NOW button
    • It will install driver and can take some time
    • Select “ok” when installation is complete

The error 'spinning up' is visible when the CI-203 is powered on and fails to verify the alignment of its lasers.

To realign the CI-203 lasers, see the procedure video.