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Enabling better global research outcomes in soil, plant & environmental monitoring.

LaiPen LP 100

The LaiPen was designed by scientists and engineers to provide its user quick and reliable results. Unlike in other similar devices measuring LAI, the LaiPen LP 100 is accurate in most daylight conditions and does not require cloud cover or specific sun angles for its proper performance.

LaiPen LP 100 measures Leaf Area Index (LAI), which is defined as the one-sided green leaf area per unit ground surface area (LAI = leaf area / ground area, m2 / m2) in broadleaf canopies. The LaiPen LP 100 calculates LAI and other canopy structure attributes from solar radiation measurements made with a wide-angle optical sensor. Measurements made above and below the canopy are used to determine canopy light interception at five angles, from which LAI is computed using a model of radiative transfer in vegetative canopies.

LaiPen LP 100 can work in two operation modes:
– Single sensor mode – reference measurement is taken before, after or during measurement with the same instrument
– Two sensor mode – second instrument is used for automatic logging of reference signal


  • High sensitivity
  • Integrated sensor for measuring foliage inclination
  • Measurement in five different acceptance angles – light is taken from five different zenith angles with one reading
  • Fast and easily repeatable measurements with instant readouts
  • Manual and automatic measurement
  • Lightweight, robust and battery-powered device with simple two-button operation
  • Large internal data storage
  • USB communication
  • External GPS module (optional)




  • Studies of canopy growth and productivity
  • Studies of forest dynamism
  • Research on air pollution or insect impact on foliage health
  • Great for rapid, repeated measurements and for large plant screening programs
  • Remote sensing
  • Global carbon cycle



Measured Parameters: – Leaf Area Index (LAI)
– Photosynthetically Active Radiation (PAR)
Detector Wavelength Range: – 400 to 700 nm bandpass filters for PAR measurement
– 400 to 500 nm bandpass filters for LAI measurement
View Restricting Cap: – Horizontal field of view: 112°
– Vertical field of view: 16°
Foliage Inclination of Measurement: View angles: 0°, 16°, 32°, 48°, 64°
Memory Capacity: Up to 16 Mb
Display: 2 x 8 characters LCD
Keypad: Sealed, 2-key tactile response
Keypad Escape Time: Turns off after 5 minutes of no use
Power Supply: 4 AAA alkaline or rechargeable batteries
Battery Life: 48 hours typical with full operation
Low Battery Detection: Low battery indication displayed
Size: 120 mm x 57 mm x 30 mm 4.7″ x 2.2″ x 1.2″
Weight: 180 g, 6.5 oz
Operating Conditions: 0 to 55ºC; 32 to 130ºF. RH: 0 to 95% (non-condensing)
Storage Conditions: -10 to 60ºC; 14 to 140ºF. RH: 0 to 95% (non-condensing)
Warranty: 1 year parts and labour