PlantPen NDVI & PRI
Quick, reliable and easy measurements in the field or laboratory
About...

PSI's PlantPen is a reflectance-based device that provides a convenient, low-cost method of measuring the relative chlorophyll content of attached or detached leaves. PlantPens are hand-held, battery-powered devices that help to characterize plants by means of reflectance. PlantPens measure and calculate specific reflectance indices to monitor chlorophyll content, photoprotecting carotenoids, and other important aspects of live foliage. Two standard PlantPen versions measure the most common indexes: Photochemical Reflectance Index (PRI) and Normalized Difference Vegetation Index (NDVI.). Comprehensive FluorPen 1.1 software provides data transfer routines and many additional features for data presentation in tables and graphs.

Key Features

  • Rugged and compact device
  • Easy-to-use two-button operation
  • Integrated GPS module


  • Comprehensive software for data processing
  • USB and Bluetooth communication for data transfer
  • Li-ion rechargeable battery via USB port of a PC

PlantPen PRI 210 and PlantPen NDVI 310

PlantPen is a reflectance-based device that provides a convenient, low-cost method of measuring the relative chlorophyll content of a leaf sample. PlantPens hand-held, battery-powered devices that help to characterize plants by means of reflectance. PlantPens measure and calculate particular reflectance indices to assess chlorophyll content, photoprotecting carotenoids, and other important features in live foliage. Two standard PlantPen versions measure the most common indexes: Photochemical Reflectance Index (PRI) and Normalized Difference Vegetation Index (NDVI.). Comprehensive FluorPen 1.1 software provides data transfer routines and many additional features for data presentation in tables and graphs.

The PlantPen model PRI 210 measures Photochemical Reflectance Index (PRI) by comparing leaf reflectance in two narrow wavelength bands centered close to 531 nm and 570 nm. PRI is sensitive to changes in carotenoid pigments that are indicative of changes in photosynthetic light use efficiency, the rate of CO2 uptake and as a reliable water-stress index. As such, it is used in studies of vegetation productivity and stress.

The PlantPen model NDVI 310 measures Normalized Difference Vegetation Index (NDVI), which is an important indicator of chlorophyll content in plants. The pigment in plant leaves, chlorophyll, strongly absorbs visible light (from 0.4 to 0.7 µm) for use in photosynthesis. The cell structure of the leaves, on the other hand, strongly reflects near-infrared light (from 0.7 to 1.1 µm). The differences in plant reflectance in the visible and near-infrared wavelengths are used to calculate NDVI index. NDVI is directly related to the photosynthetic capacity and hence energy absorption of plant canopies.


APPLICATIONS


  • Fast screening of chlorophyll content
  • Field studies
  • Early stress detection
  • Nutrition effects
  • Agronomy & forestry

PLANTPENS MEASURE


  • Normalized Difference Vegetation Index (NDVI)
  • NDVI = (RNIR – RRED ) / (RNIR + RRED )
  • PRI (Photochemical Reflectance Index)
  • PRI = (R531 – R570) / (R531 + R570)

SOFTWARE


  • FluorPen 1.1 software (Windows 7 or higher compatible)
  • Bluetooth and USB communication
  • Visualization and data transfer routines to Microsoft Excel (optional)
  • GPS mapping

Versions

PlantPen PRI 210 - measures Photochemical Reflectance Index (PRI) by comparing leaf reflectance in two narrow wavelength bands centered close to 531 nm and 570 nm. PRI is sensitive to changes in carotenoid pigments that are indicative of changes in photosynthetic light use efficiency, the rate of CO2 uptake and as a reliable water-stress index. As such, it is used in studies of vegetation productivity and stress.

PlantPen NDVI 310 - measures Normalized Difference Vegetation Index (NDVI), which is an important indicator of chlorophyll content in plants. The pigment in plant leaves, chlorophyll, strongly absorbs visible light (from 0.4 to 0.7 µm) for use in photosynthesis. The cell structure of the leaves, on the other hand, strongly reflects near-infrared light (from 0.7 to 1.1 µm). The differences in plant reflectance in the visible and near-infrared wavelengths are used to calculate NDVI index. NDVI is directly related to the photosynthetic capacity and hence energy absorption of plant canopies.


Specifications

Measured Parameter:
PRI (Photochemical Reflectance Index) = (R531 – R570) / (R531 + R570) Reference: Sellers et al. (1985)
NDVI (Normalized Difference Vegetative Index) = (R740 – R660) / (R740 + R660) Reference: Rouse et al. (1974)

Measuring Light:
Internal dual wavelength light source R531 = 531 nm, R570 = 570 nm for PRI 210
Internal dual wavelength light source VIS = 635nm, NIR = 760nm for NDVI 310

Detector Wavelength Range:
PIN photodiode with 500 to 600 nm bandpass filters for PRI 210;
PIN photodiode with 620 to 750 nm bandpass filters for NDVI 310

FluorPen 1.1 Software: Windows 7 or higher

Sample Holder: Mechanical leaf clip

Bios: Upgradeable firmware

Memory Capacity: 16MBit

Communication for data transfer: USB and Bluetooth

Internal Data Logging: Up to 100,000 data points

Display: Graphical display

Keypad: Sealed, 2-key tactile response

Keypad Escape Time: Turns off after 5 minutes of no use

Power Save Mode: Autosleep

Power Supply: Li-ion rechargeable battery

Battery Capacity: 2000 mAh

Max. Charging Current: 0.5 A

Charging via USB port: PC, power bank, USB charger, etc.

Battery Life: 70 hours typical with full operation

Low Battery Detection: Low battery indication displayed

Size: 135x 65 x 33 mm

Weight: 188 g

Operating Conditions:
Temperature: 0 to +55ºC
Relative humidity: 0 to 95% (non-condensing)
Storage Conditions:
Temperature: -10 to +60ºC
Relative humidity: 0 to 95% (non-condensing)

Accessories

Mini-Computer

Small, portable notebook (type according to current availability on the market).

Substitute USB Communication Cable

Substitute USB cable allowing connection between the "pen" devices and a PC (the device is delivered with one USB cable, which is included in the device price).

Self-Adhesive Rubber Pads

One set includes 10 solid pads (to be attached to the clip) and 10 pads with an opening (to be attached at the optical head).

Pricing


PlantPen
Version Characteristics Price
PlantPen NDVI 310 Standard version supplemented by the Bluetooth, USB communication,
GPS module and dedicated software for data collection and visualization.
1,599 €
PlantPen PRI 210 Standard version supplemented by the Bluetooth, USB communication,
GPS module and dedicated software for data collection and visualization.
1,799 €

Accessories

Mini-Computer * Small, portable notebook (type according to current availability on the market). 390 €
Self-Adhesive Rubber Pads One set includes 10 solid pads (to be attached to the clip) and 10 pads
with an opening (to be attached at the optical head).
12 €
Substitute USB
Communication Cable *
Substitute USB cable allowing connection between the "pen" devices and a PC
(the "pen" device is delivered with one USB cable).
39 €