The CIRAS-2 is a "true differential" system. It features four independent, non-dispersive infrared gas analyzers for accurate, simultaneous measurement of both CO₂ and H₂O, eliminating the problems associated with "gas switching" systems. Three input channels are available for % R.H., temperature and PAR sensors plus a full range of cuvettes and chambers for leaf gas exchange, whole plant gas exchange,  soil respiration and chlorophyll fluorescence measurement.

Ciras-2 Portable Photosynthesis System
 

ACCUPAR LP-80 offers improved flexibility for measuring Photosynthetically Active Radiation (PAR) and Leaf Area Index (LAI). ACCUPAR LP-80 utilizes an 80cm probe containing 80 photo diode sensors, which can easily detects gradual light changes at all levels of your plant canopy. It also inverts PAR to interrogate sensors individually or average PAR readings throughout the canopy.

ACCUPAR LP-80
 

The EMS-7 is a portable system for the determination of PAR above and within plant canopies. As such, it is extremely useful in plant physiological and ecological studies.

EMS-7 Plant Canopy Transmission Meter
 

• SpectroSense2 is 4-Channel meter for light sensors
• SpectroSense2+ is an 8-channel logger & meter
• Designed for single channel, 2-channel, or 4-channel sensor types
• Can also be used with light sensors from most other manufacturers
• SpectroSense2 displays readings from 4 sensors or channels simultaneously and SpectroSense2+displays and logs from 8 sensors or channels
• Displays sensor ratios for NDVI calculations
• Hold & store functions
• Ideal for ground truth measurements

SpectroSense2 with NDVI Application

These sensors, traditionally used in plant growth studies, count the number of quanta falling between 400 and 700 nm.
The PAR Quantum is the sensor with the ideal 100% quantum efficiency curve and is traditionally used in plant growth studies. The spectral response has been well researched and documented and is widely accepted as 'the standard'.

PAR Quantum (SKP 215) & PAR 'Special' (SKP 210)

A 2-channel sensor with narrow band filters centred at 660nm and 730nm. A very popular filter combination important for plant phytochrome studies, and controlling plant responses in mixed lighting conditions.

Red/Far-Red Sensor (SKR 110)

The FieldScout CM 1000 NDVI Meter uses ¡°point-and-shoot¡± technology to instantly measure reflected light in the red (660nm) and near infrared (840nm) spectral bands. Meter uses red and near infrared reflectances to calculate NDVI. At 12in(30cm), it integrates a 1.5in(4cm) diameter area on a plant leaf or, at 4ft(1.2m), a 4.5in(11cm) diameter spot on a plant. Laser guides outline the edges of the measured sample area. An ambient light sensor automatically corrects measurements for varying light conditions. The handheld meter calculates and displays a running average for multiple readings. 

FieldScout CM 1000 NDVI Meter
 

The SPAD 502 Plus Chlorophyll Meter instantly measures chlorophyll content or ¡°greenness¡± of your plants to reduce the risk of yield-limiting deficiencies or costly overfertilizing. The SPAD 502 Plus quantifies subtle changes or trends in plant health long before they¡¯re visible to the human eye. Non-invasive measurement; simply clamp the meter over leafy tissue, and receive an indexed chlorophyll content reading (0-99.9) in less than 2 seconds. Assess nitrogen needs by comparing in-field SPAD readings to university guidelines or to adequately fertilized reference strips. Research shows a strong correlation between SPAD measurements and leaf N content.

New features in the SPAD 502 Plus include:

• Trend graphing stores and displays up to 30 measurements

• Waterproof design

SPAD 502 Plus & 502DL Plus