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

N-Pen N 100

N-Pen is a light-weight, battery-powered reflectance-based instrument that provides a convenient, cost-effective method for effective nitrogen management in plants throughout their growing season. Essentially, the N-Pen characterises nitrogen amount by means of reflectance and by the concept of a close link between chlorophyll content and nitrogen content in plants.

Rugged and compact, the N-Pen can be used in the field, in the plant biology lab, or for education. The use of the N-Pen is non-destructive and permits quick, repeated measurements throughout the growing season. It takes four AAA alkaline batteries and is supplied in a robust case.

N-Pen versions with a PC communication module – Bluetooth or USB – are also available. Comprehensive FluorPen software provides data transfer routines and many additional features for data presentation in tables and graphs.

Currently Available Calibrations:

  • Maize
  • Wheat
  • Barley
Measured Parameters: Nitrogen content calibrated for particular plant
Measuring Light: Dual wavelength light source – 565 nm, 760 nm
Optical Aperture Diameter: 5 mm
Detector Wavelength Range: 500 to 800 nm bandpass filters
Memory Capacity: Up to 16 Mb
Display: 2 x 8 characters LCD
Keypad: Sealed, 2-key tactile response
Keypad Escape Time: Turns off after 3 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: 170 x 57 x 30 mm; 6.7″ 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

N-Pen Measures:

  • N-Pen measures actual nitrogen content using the Normalised Difference Greenness Index NDGI
  • Nitrogen reading is calibrated for particular plant (wheat, barley or maize) and is displayed as %
  • Variety or hybrid differences can greatly affect N-Pen readings
  • Plant diseases, nutrient deficiencies and other kinds of plant stress can also affect N-Pen readings

N-Pen Sampling:

  • Difference Greenness Index NDGI
  • Nitrogen reading is calibrated for particular plant (wheat, barley or maize) and is displayed as %
  • Variety or hybrid differences can greatly affect N-Pen readings
  • Plant diseases, nutrient deficiencies and other kinds of plant stress can also affect N-Pen readings
  • Simply insert the leaf between the leaf clip and the optical tip
  • N-Pen collects and stores individual readings and calculates the average automatically
  • Readings should be taken on different plants of the same species
  • Readings should be taken on the 2nd (maximum 3rd) youngest leaf on each plant
  • Readings should be taken on about the same location on each leaf (close to the mid part)