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
 

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