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ENVME is now the exclusive US distributor of the Portable Leaf Area Index Meter MIJ-15LAI/P. This Japanese manufactured product is the world’s only leaf area index meter that quantifies LAI measurement by by measuring the spectral ratio of sunlight received directly below a plant canopy. We are offering the MIJ-15LAI/P full package for $CHECK WITH US. The fixed-position only MIJ-15LAI Type II/K2 meter is $CHECK WITH US and the optional monopod is $CHECK WITH US. Please contact us for more information regarding pricing and lead times because these fluctuate.

Portable Leaf Area Index Meter MIJ-15LAI/P & Leaf Area Index Sensor MIJ-15LAI TypeII/K2 

Conventional measuring instruments of Leaf Area Index (hereafter referred to as LAI) compare light intensity outside and inside a plant canopy. The MIJ-15LAI/P and MIJ-15LAI Type2/K2 quantifY LAI by measuring the spectral ratio of sunlight transmitted through the plant canopy, with no additional measurements being required.



  • The world's only sensor that determines LAI by correlating the relationship between the spectral ratio of Photosynthetically Active Radiation (PAR) and Infrared Radiation (IR).
  • Regardless of cloudy or clear weather, just by pressing a button, instantaneous LAI measurement is obtained.
  • True LAI measurement is capable of counting only live leaves, not PAI (Plant Area Index) where influences such as dead

    leaves, branches & trunks remain.

  • Two models are available: The /K2 is for fixed-position observation, the /P additionally allows for mobile handheld measurement.



The measurement principle with conventional plant canopy analyzers use the same principle as the area ratio of so-called monochrome photography, which detect light intensity inside and outside the plant canopy and replace the bright/dark ratio with LAI. Generally, unless the sky is crystal clear, the intensity of sunlight reaching the ground is variable due to the influence of clouds. For this reason, measurements are useless unless we measure both light intensity outside and inside the canopy at the same time. In order to measure LAI only by measurement inside the canopy, conventionally there is the inconvenience that it can be done only in cloudy weather where solar radiation intensity is relatively stable. Even when measurements are made under such circumstances, light shielding structures including the trunk, branches, and dead leaves greatly affect light intensity. Measurements taken under these circumstances are much more likely to obtain the Plant Area Index (PAI), not the Leaf Area Index (LEI). If you want to measure LAI instead of PAI, you need to correct the value of PAI and convert it to LAI using canopy measurement data of only branches and trunks after leaves have fallen in winter. In the case of plants that are not deciduous, this kind of correction is not possible.


MIJ-15s use a patented measurement method JP 5410323 B2 2014.2.5 which use two spectral absorbencies, PAR (400-700 nm) and NIR (700-1000 nm) which are reflected and absorbed by chlorophyll in leaves, and the ratio of transmitted light correlates with LAI. With this method, it is possible to obtain accurate measurements of LAI regardless of the weather. The light environment outside the canopy is irrelevant. Overall, LAI measurement with less disturbance factors and high repeatability have been realized.



Display: LAI, NIR, PAR & Battery Voltage

Regression Eq.: LAI = 2.80 In(NIR/PAR) + 0.69

Unit: NIR and PAR / uE(umol * S-1 * m - 2), LAI / m2/m2

Operating Temp: -25 ~ 60 degrees Celsius

Data storage: 125,000 measurements

Battery: 4 AA

Dimensions: Sensor, 126mm x 49mm x 60mm (without gun grip); Logger, 80mm x 189mm x 35mm

Cable length: 15M

Weight: 1.25Kg, 3.5Kg (Full Package)

Environmental Measurement


PO Box 44, Mount Vernon, OR 97865