SPAD 502 Plus Chlorophyll Meter with or without data logger (select options in "select model").
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 (-9.9 to 199.9) 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.
Instantly measures chlorophyll content or “greenness” of your plants on a scale of -9.9 to 199.9
Non-invasive, non-destructive measurement
Trend graph stores and displays up to 30 measurements
Compare in-field SPAD readings to university guidelines
Research shows a strong correlation between SPAD measurements and leaf N content
Available with or without a built-in data logger
Includes hard carrying case and batteries
Optical Density Difference at two wavelengths: 650 nm and 940 nm
Measurement Area: 2 mm x 3 mm (Approximately 3/32 in x 1/8 in)
Light Source: 2 LEDs
Receptor: Silicon Photodiode
Power Source: 2 AA alkaline batteries (1.5V)
Repeatability: Within ±0.3 SPAD unit
SPAD Value: Index of relative chlorophyll content; -9.9 to 199.9