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The GreenSeeker handheld crop sensor is an affordable, easy to use measurement device that can be used to assess the health—or vigor—of a crop. Readings taken by the GreenSeeker handheld can be used to make non-subjective decisions regarding the amount of fertilizer to be applied to a crop, resulting in a more efficient use of fertilizer—a benefit to both a farmer’s bottom line and the environment.


Use the Connected Farm™ app on a smartphone or tablet to calculate fertilizer application rates from crop readings taken with the GreenSeeker handheld.

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How Does it Work?

  • Upon pulling the trigger, the sensor turns on, emits brief bursts of red and infrared light, and then measures the amount of each type of light that is reflected back at the sensor.


  • The sensor continues to sample the scanned area as long as the trigger remains engaged.

  • The strength of the detected light is a direct indicator of the vigor - or health - of the crop.

  • The sensor displays the measured value in terms of an NDVI reading on its LCD display screen.  NDVI readings can range from 0.00 to 0.99; the higher the reading, the healthier the plant.



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            To ensure the accuracy of your readings, hold the sensor 24" – 48" (60 – 120 cm) above the crop when the trigger is pulled.                                                                  The sensor's field of view is an oval; the field of view widens as the height of the sensor above the ground increases.

Included Accessories

  • Sensor battery
  • Wrist strap
  • AC charger
  • USB-to-microUSB cable
  • Carrying pouch
  • Quick Reference Card
  • Fertilizer Estimation Chart


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  Battery 3.7VDC nominal, 1130 mAh
  Charging 5VDC, 320mA max
  Charging Time 5 hour (full charge)
  Dimensions 3.5" x 10.5" (9 cm x 27 cm)
  Weight 11 oz. (310 g), including battery
  Material Xenoy plastic
  Rating IP54
Emission Wavelengths
  Red 660 nm, ~25 nm FWHM
  Near infrared 780 nm, ~25 nm FWHM
  Field of view 10" at 24”, 20" at 48”
  Height range 24" - 48"
  Remote trigger switch port 2.5 mm stereo phone jack
  Charging port Micro-B (micro USB)
  Charging 10°C – 40°C
  Operating (non-charging) 10°C – 50°C
  Storage -10°C – 70°C


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