SPAD 502 Plus Chlorophyll 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 (-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.
The SPAD 502 Plus meter can be purchased with or without a built-in data logger. The data logging version (Item 2900PDL) allows you to compile readings for statistical analysis. Includes an RS-232 port for communicating with a PC and/or portable GPS receiver. Use geo-referenced data to correlate N measurements to yield maps or download the data into mapping software. This robust field-data collection device has a capacity of 1,488 measurements when coupled with a GPS receiver or 4,096 measurements when used without GPS. Requires software running on Windows 98 or higher. GPS/DGPS cable required for geo-referenced operation. Use the powerful SpecMaps online application to discover the value of spatially variable sensor measurements. Mapping software requires GPS; not included.
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Instantly measures chlorophyll content or “greenness” of your plants on a scale of 0.0 to 99.9
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Non-invasive, non-destructive measurement
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Trend graph stores and displays up to 30 measurements
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Waterproof design
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Compare in-field SPAD readings to university guidelines
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Research shows a strong correlation between SPAD measurements and leaf N content
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Available with or without a built-in data logger Data-logging unit (2900PDL)
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Connects to any GPS receiver with serial output option**
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Equipped with internal data logger and RS-232 port
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Records 4,096 measurements (1,488 with added GPS/DGPS option)
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Configure and download meter with FieldScout software (included)*
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Compatible with SpecMaps online web-mapping application
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Includes hard carrying case
* Spectrum’s PC cables connect to a 9-pin serial port. USB-Serial adapter (Item 3661USB) required for connection to computers with only USB ports.
** GPS interface requires two cables. The GPS/DGPS cable (Item 2950CV5) is available from Spectrum. A PC serial interface cable supplied by the manufacturer of the GPS receiver is also required.
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 99.9