Spectrum Technologies

Spectrum SPAD 502 Plus Chlorophyll Meter

Soil & CropsPhotosynthesis Chlorophyll & Respiration

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.

Quantity

Overview

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
Waterproof design
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

Specification

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