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.
Features
- 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
| 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 |
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